Physics Unit23: Light and Geometric Optics - 51fly国际课程 (51fly.win)

1#

Reflection, refraction, and the formation of images by mirrors and lenses has bpnb9f0t 2s 4jjeen sucjn2 bjf4 t09pscessful described by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidenc msb6yx lvg7qsl p-8(,e

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

D. may be greater than, less than, or equal to the angle of reflection.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which m x4c y)a aiqu+rb4wb7(irrors work is

A. refraction.

B. polarization.

C. dispersion.

D. reflection.

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plane mirror forms an imagv muh;60nsbej5x 8 ha2/z9kalq5kkd, 4 oqv8 ze that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce images wheyik1 ;jihr(wr:z92;r5cq rw ich

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller, larger, or the same size as the actual object, depending on the placement of the object.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actually pass through the image locgr5k;- 5boqrtation, and would not appear on paper or film placed at that location is referr5br qo;tk5r -ged to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light r/n 7c0cld *5pt89d:e mqcvenln2a p7tays pass through the image location, and could appear on paper or film placed at the that location is referred 2pplc05 7c l/c78 nntqvden*9 d :etamto as

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is it possible to see a55n 43) azvirp h6xii*rf3xnjg54dae virtual image?

A. No, since the rays that seem to emanate from a virtual image do not in fact emanate from the image.

B. No, since virtual images do not really exist.

C. Yes, the rays that appear to emanate from a virtual image can be focused on the retina just like those from an illuminated object.

D. Yes, since almost everything we see is virtual because most things do not themselves give off light, but only reflect light coming from some other source.

E. Yes, but only indirectly in the sense that if the virtual image is formed on a sheet of photographic film, one could later look at the picture formed.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the outer surface of th4 yva0n g.yh7ph*29eqs:r hv fe sphe a:7s 2yh.h9rh0ng 4yvvfqe*prical shape is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the inner sz/8yjrj* tmfvyvo(hh wb;/w+ bb0 45w urface of the sphere is referred to jb//r8h0*o;wz (w fvbm+wj v4 ybyth5as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the radius of curvature oq(/vta 90gt,wb xa *x3t.htee f the concave mirror is r, the focal length is

A. 2r

B. r

C. r/2

D. cannot be determined from the information given

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallerg*0nv /19ch qmyi7 zel to a concave mirror's axis, strikes the mirror's surface near its midpoint. After reflection, 7ienzyr9 c qvh/g*0m1this ray

A. again travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path parallel to the axis is sv , 9/2rrjwsfreflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveliictd 4 u;pm+v4ng obliquely to a concave mirror's axis, crosses the axis at the mirror's center of curvature bepu;4i 4dtv +mcfore striking the mirror's surface. After reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a patq t0jnx(e, ivys/ ,t;fal bo7,6rbze; h through the center of curvature is ret eo brq /l,z;ts(0ven,,7 xayf;6bjiflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. midway between the focal point and the center of curvature.

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's surface, crosu w5ipb thm*:o9ft5 e 8jc4c4pses the axis at the mirror's focal point before striking the mirror's surface. if jwt*5u4:obe 8c p9h p5cm4tAfter reflection, this ray

A. travels parallel to the mirror's axis.

B. travels at right angles to the mirror's axis.

C. passes through the mirror's center of curvature.

D. passes through the mirror's focal point.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirror on a path through the foc 0vcco3y r*x:2dg(2 eicng6 ud8 udt5oal point is reflectedd3geur 0ody2to2n*i:cv 6d u(cc8x5g

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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18#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding the image position duenge)f5-livo 77(b.lq stmx-s7 :bju d to a curved mirl g-um(tq77ds o5.ejb7v )-fn:blxs iror.

该题自我估分: (必填) (满分:1.0分)

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a concave mirror, exactly(2rmnuc,i og0fmf5 i , at its focal point,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image, and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's center of n v; ;ai9cd-lncurvature. The image produced b9c-an di; v;nly the mirror is located

A. out beyond the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is positioned between a concave mirrorvuza 8x k5nhu*t1v-9f's center of curvature and its focal point. The image v-51k*uav89 tn uhzx fproduced by the mirror is located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirroq*0ydyvro3 +o1ld(xo r's surface and its focal point. The xrood* qy y0vd1o+3l(image formed in this case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance from it as it2edy5:u4qf4p s 7fx l fbu7/zzs radius of curvatpff 2fqzs ub 4/z75uld7:4xe yure,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex u0 zbw42e9apd mirror, at the same distance from it as its focal lengw 0upeba2 dz94th,

A. you won't see your image because there is none.

B. you won't see your image because it's focused at a different distance.

C. you will see your image and you will appear smaller.

D. you will see your image and you will appear larger.

E. you will see your image at your same height.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Sometimes when you look into a curved mirror you see a ppp- 1xd t .76n3ppmkfmagnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (co3p-16mpdxnp kpft. p7 nvex) side of a shiny spoon, what will you see?

A. You won't see an image of yourself because no image will be formed.

B. You will see a little you, upside down.

C. You will see a little you, right side up.

D. You will see a little you, but whether you are right side up or upside down depends on how near you are to the spoon.

E. You will either see a little you or a great big you, depending on how near you are to the spoon.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Concave spherical mirrors produce images whic1wyv,lpl 6 -u 3cxsu:zh

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be smaller than, larger than, or the same size as the actual object, depending on the placement of the object.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors produce y:r fk-wr3:9t pmgox :images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

C. are always the same size as the actual object.

D. could be larger than, smaller than, or the same size as the actual object, depending on the placement of the object.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produces an image which ib+n)qftl b rd, kk( z*.+shj7ss

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces an iz xo q/m,qy:/cmage which is

A. always virtual.

B. always real.

C. real only if the object distance is less than $f$.

D. real only if the object distance is greater than $f$.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A negative magnification for a micbv;ncw5uzo q *6qeb6 h.12l1 xd 8maorror means

A. the image is inverted, and the mirror is concave.

B. the image is inverted, and the mirror is convex.

C. the image is inverted, and the mirror may be concave or convex.

D. the image is upright, and the mirror is convex.

E. the image is upright, and the mirror may be concave or convex.

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is positive, z+hq ddfv)a cw7i0om,r- -*iy the image formed is

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negativ:( i hrkrhs rk tcw.88q/nvl8:e, the image formed is

A. real image.

B. virtual image.

C. either a real or virtual image.

D. can not be determined.

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is a positive value, the imagz e tj93tn0ae,e is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the magnification is :z; pw: plb9mqa negative value, the image is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value g-tc cv) rkyzp1q81jc 2f rf4.of the magnification is larger than one, then the image is)2c8 rkfp-cf q1 1vcrtyg4j.z

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnifica g5 kw-i,3ncg/t9vta mtion is smaller than one, then the image isgwa cktn5,m3v9igt - /

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is equal to x8k;/wbo himm3s3vll g2.kk -one, then the image is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastesttrlr0.5gcn4 6u g h3ua

A. in a vacuum.

B. through water.

C. through glass.

D. through diamond.

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

For all transparent material substancesnr :ajg6zv5(4 zchq/ l, the index of refraction

A. is less than 1.

B. is greater than 1.

C. is equal to 1.

D. could be any of the given answers as it all depends on optical density.

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An index of refraction less than uo:c4rg7p z5s p7r6sk one for a medium would imply

A. that the speed of light in the medium is the same as the speed of light in vacuum.

B. that the speed of light in the medium is greater than the speed of light in vacuum.

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction of diamond is j6) s+ lk7e h8jyc2fzfts;(mi$2.42$. This means that a given frequency of light travels

A. 2.42 times faster in air than it does in diamond.

B. 2.42 times faster in diamond than it does in air.

C. 2.42 times faster in vacuum than it does in diamond.

D. 2.42 times faster in diamond than it does in vacuum.

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidencec69au4 k,eu jo

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

D. may be greater than, less than, or equal to the angle of refraction.

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an angle into a denser medium is refra 7og9ovxns n7l(9a) oucted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The0xpsf+iyqiug w .4/ l(*4vrf g angle of refraction will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident on a glass plate y ec yp)caq/0rt:otn2/i;ab .at a $45^{\circ}$ angle. The angle of refraction in the glass

A. is less than $45^{\circ}$.

B. is greater than $45^{\circ}$.

C. is equal to $45^{\circ}$.

D. could be any of the above; it all depends on the index of refraction of glass.

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber o ni4of9r.f /5chy0e-f gjj ,lxptics is based is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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47#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a beam of light passing from w ny4x3 up7gbis))4q5zsf* ykzater into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lenses workgqae9:78erq f8wo r rs)hch j3(f+8zus)ks- a is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicke: c rgbl;rtp5,c m2mbgxag6v4ho (55bst at the center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the center than3,e6 n/uxn1af pv4ub q the edges are called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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51#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thicker 7cys3 wba);s mat the center

A. spread out light rays.

B. bend light rays to a point beyond the lens.

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lens v5bfg , rpb,p)3v8wf qyics9: B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focal length of 5v8,c)pifbbsqrg y: fw,9vp3lens B is

A. one-fourth of the focal length of lens A.

B. one-half of the focal length of lens A.

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a thin concave lens, strikes 3 r.3 ts)yn60zhtz oh8rj)w b5yh*diothe lens near its midpoint. After traveling though the lens, this ray e )8 ohj 5tzzs.h6dy3iw0ot r)3y*hbnrmerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through the focal point.

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54#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis e/vmz yn8h 6z1of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to thv8mnz 61yez /he axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rayvj+wp+xt n6 k9s for finding the image position due to a thin lens.x 69vw kt+pn+j

该题自我估分: (必填) (满分:1.0分)

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56#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has focal lengtt 4bzde p a8/;iu:8shzh $f$. An object is located at infinity. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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57#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lengtj3ypzulrd0 )v18f kk4h $f$. An object is placed at $f$ on the axis. The image formed is located

A. at infinity.

B. between $2f$ and infinity.

C. at $2f$.

D. between $f$ and $2f$.

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58#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lengt+lf g9)p7w zioh $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal rg)(k+) th0nsaseqrur6iq3lz. qx2- length $f$. An object is placed between $f$ and $2f$ on the axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. at a distance greater than $2f$ from the lens.

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60#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal lep 8r2xrsw 07qrngth $f$. An object is placed between infinity and $2f$ from the lens on its axis. The image formed is located

A. at $2f$.

B. between $f$ and $2f$.

C. at $f$.

D. between the lens and $f$.

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61#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is placed between a convex lens and itsr tt q,5jfm5pv3-yy- n5p ycg* focal point. The image formed i5fp- ytm *qgvncpt3 5-r5jy,ys

A. virtual and erect.

B. virtual and inverted.

C. real and erect.

D. real and inverted.

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62#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The images formed by concave lense) iojo l*4jy8e7 )j *yr ktp/mfzk:j0xs

A. are always real.

B. are always virtual.

C. could be real or virtual; it depends on whether the object distance is smaller or greater than the focal length.

D. could be real or virtual, but always real when the object is placed at the focal point.

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The image of the rare stamp you see through a magnifying g,o6 d0)k;qyfx7 epjt5wsd g3o lass is

A. always the same orientation as the stamp.

B. always upside-down compared to the stamp.

C. either the same orientation or upside-down, depending on how close the stamp is to the glass.

D. either the same orientation or upside-down, depending on the thickness of the glass used.

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64#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A lamp is placed 1 m from a screen..mt a62+ 8v m)qpxzc:+iminww Between the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the scre+ nmw:6m)i8mp2.+ zaxcwt ivqen. As the lens position is varied with respect to the lamp,

A. no sharp image will be seen for any lens position.

B. a sharp image will be seen when the lens is halfway between the lamp and the screen.

C. a sharp image will be seen when the lens is 40 cm from the lamp.

D. a sharp image will be seen when the lens is 60 cm from the lamp.

E. a sharp image will be seen when the lens is either 40 cm from the lamp or 60 cm from the lamp, but not otherwise.

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of foc wi5 i(y8rhf8pk5yx,ty 3t4dgal lengths $f_1$ and $f_2$ placed in contact with each other are equivalent to a single lens of focal length of

A. $f_1 + f_2$.

B. $1/(f_1 + f_2)$.

C. $(f_1 + f_2)/f_1 f_2$.

D. $f_1 f_2/(f_1 + f_2)$.

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66#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin double-convex (convex-convex) lenses are placed in contact. y9zjj3(9vpk)xd g .nf If each has a focal length of 20 cm, how would you expect the combination to functio) y n9gf9 v.jpk3zjd(xn?

A. about like a single lens of focal length 20 cm

B. about like a single lens of focal length 40 cm

C. about like a single lens of focal length slightly greater than 20 cm

D. about like a single lens of focal length less than 20 cm

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67#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diverging lens ($f = -4.0 \; cm$) is positioned 2.0 cm to the left of a converging lens ($f = +6.0 \; cm$). A 1.0-mm diameter beam of parallel light rays is incident on the diverging lens from the left. After leaving the converging lens, the outgoing rays

A. converge.

B. diverge.

C. form a parallel beam of diameter D > 1.0 mm.

D. form a parallel beam of diameter D < 1.0 mm.

E. will travel back toward the light source.

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68#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A laser beam strikes a planru3 o4q0vmt5/z r1crxl 0xq8ue's reflecting surface with an angle of incidence of x4o 510l0t/3xrqz vmurrcqu8 $52^{\circ}$. What is the angle between the incident ray and the reflected ray?

A. $52^{\circ}$

B. $105^{\circ}$

C. $45^{\circ}$

D. $90^{\circ}$

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69#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is located 2.6 m in front of/d bb7iso::gu a plane mirror. The image formed by the mirror aub :/o7dbsgi:ppears to be

A. 1.3 m in front of the mirror.

B. on the mirror's surface.

C. 1.3 m behind the mirror's surface.

D. 2.6 m behind the mirror's surface.

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70#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far are you from your imahfkgzad agyi-b ,5r690c2gk 7ge when you stand 0.75 m in front of a vertical plane , gig5ykzagkbrd2hfa7 c -609mirror?

A. $0.75 \; m$

B. $1.5 \; m$

C. $3.0 \; m$

D. none of the given answers

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71#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How fast do you approach your image whb o ,9pm+ucs+hen you approach a vertical plane mirror at a speed of 2 m/s?o,9uc+ bhms+ p

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror hivqjezccehdw+ *0do/ 9-b/ky.9 mw: tas a radius of curvature of 20 cm. How far from the mirror is the fq- wc:/ tdoi k/90ez+e*dmw.cbvj yh 9ocal point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm creates a real y )l/ofk 3hb/r yq/z(ximage 30 cm from the mirror. 3)rqh kl f//(yy/b xoz What is the object distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in ;w4gj0h fjqq( front of a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal leng qw0 (qf;h4jjgth of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with focal length 3 cm. Whe2c cvqo3oa3) ere is the3 cve2ao3o)cq image?

A. 13 cm from the mirror

B. 7.0 cm from the mirror

C. 4.3 cm from the mirror

D. 3.3 cm from the mirror

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76#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal length of 20 cm. An object zk6 b7jqc6b -2tyd e+kis placed 10 cm in front of the mirror on the mirror's axis. Where is the image bdz6 2ebkctyq6k-+7j located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a foca1ehrz1pl3w 47 uqd+svl length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the iml 4w 31 qd+7ep1rzuhvsage located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror. t2h 1jz brrh:. uzu;-6 k:2fm9 pckckqThe image is 4.7 cm tall, and 10 cm from the mirror. How tall ihr: .-2tuhzfmruj 2 :qzcbk;k p9c16ks the object?

A. $12 \; cm$

B. $11 \; cm$

C. $8.2 \; cm$

D. $2.7 \; cm$

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79#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror of focal ex +o7f07hr brlength 20 cm. The object is 4.0 cm erxbo07 h+7f rtall. How tall is the image?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image ig n k)zk;m1p.3mv/zlld) k,eyi, bwjr:cxa (7s 38.6 cm tall, and 14.8 cm from the mirror. How far is the object from tarl k,ip,;.dcg1bm y vz)z ( jlne m/3)k7xkw:he mirror?

A. $124 \; cm$

B. $47.6 \; cm$

C. $18.2 \; cm$

D. $12.0 \; cm$

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81#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 1.4 cm tall object is 4phf20 4 2byjchq orc .4j,zc z4y8c3bn.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it from the mirr,cj jocby yq3r fphh 0.2c444n8c2zbzor?

A. $11 \; cm$

B. $9.4 \; cm$

C. $1.4 \; cm$

D. $0.090 \; cm$

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82#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 15 cm from a concave mirror ofpy*o4 ,v d.vf09y5unzn)pt pi focal length 20 cm. The object is90n 4pu5dpynov) *vpz f,it. y 4.0 cm tall. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in i0c7q( leogvg*elj3*front of a cosmetic mirror (concave mirror), the erect image is twice the size of the obji0llg73coq(e e*j* vg ect. What is the focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front o1fd :uf9x 1d(hswgw(qt:11rk h(uuo of a concave shaving mirror. If the image is an erect image 1.5 times as ufwkqd x:fhhts9o(:r1d(g111 u owu(large as the object, what is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behiq-u/eii o,+o iezzi( f,he58mnd a concave mirror with focal length 5.0 cm. Where is the objecteiz/ue q8o(i zh5eif,o-+mi,?

A. 2.2 cm in front of the mirror

B. 2.2 cm behind the mirror

C. 9.0 cm in front of the mirror

D. 1.0 cm behind the mirror

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86#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focal length of x;7ulm j0jhok3ip+r- qci.g 1-20 cm. An object is placed 10 cm in fr+i-.k;jgu 7j0x13clm irophqont of the mirror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirror has a focalousy0ac egn9,.w:3 eoa. r* cm length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the y .,mc93 ee ngo0uw:aoarcs*. image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in front of a convex mirror. The image is 7+ivfk3 enyh23n8yx:hy po 6x8 uzns+5.8 cm behind the mirror. What is the fo3nxvzi:8nux+o hkfn7 3 e6y8hps2y+ ycal length of the mirror?

A. -4.1 cm

B. -8.2 cm

C. -9.9 cm

D. -20 cm

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89#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 8.90 cm tall. The image is 7.80 cm tall, and 14.8 cm from atmn+6)xex en/iq0 j /y5vqp e8 convex mirror. What is the mirror's focal len5 yqtnq6e)m iepn jxe+8 vx0//gth?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an i-bihqef;4de dx8t.f -ndex of refraction of 1.50, what is the speed of light through qbhf8e;td- 4f -ide .xit?

A. $2.00 \times 10^{8} \; m/s$

B. $3.00 \times 10^{8} \; m/s$

C. $4.50 \times 10^{8} \; m/s$

D. $6.00 \times 10^{8} \; m/s$

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91#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray in air is incident on an air to glass interfacei b:jin -rv9-o at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance fr7r-qpn3t i .8oj h,xjdom air at an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incoming ray is at an angle of c di*n8-auits7 dzryk+wx9// $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smiwj4mev9y 06z oothly and evenly over the surface of water on a windless day. What is the angle of refraction in the wate6zm9i y 4ej0vwr for a ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surrqs m*6;hngcqf7;k v ,j+n:knface of a still pond of water. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The n hcr +6gv*:,f;qkj snmkqn ;7index of refraction for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in;4gubfv,ni0t w-q0yf 5*b vmv air, strikes a plate of transparent material at an angle of incidence ofb,y*bv5 g0twv fnm0v4;uiq-f $56.0^{\circ}$. It is observed that the reflected and refracted beams form an angle of $90.0^{\circ}$. What is the index of refraction of this material?

A. 1.40

B. 1.43

C. 1.44

D. 1.48

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97#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light traveling in a s(/dn/ mebth;-f f,jwir is incident on a slab of transparent material. The incident beadh;/f(mnfte -,ws bj/ m and the refracted beam make angles of $40^{\circ}$ and $26^{\circ}$ to the normal. What is the speed of light in the transparent material?

A. $1.0 \times 10^{8} \; m/s$

B. $2.0 \times 10^{8} \; m/s$

C. $2.3 \times 10^{8} \; m/s$

D. $3.0 \times 10^{8} \; m/s$

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98#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A substance has an index op8r2jq)ssw 5 uf refraction of 1.46. Light is passing through it at 8qj2u s) rwp5s$53.0^{\circ}$. At what angle will it leave into the air?

A. It will not leave.

B. $59.1^{\circ}$

C. $43.2^{\circ}$

D. $33.2^{\circ}$

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99#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the critical angle for lvx2 awai ru-h1nk9r ut g*-0k7ight traveling from crown glass (n = 1.52) into water (n = 1.3i0 9gwu-karanhk t2 1xru7-*v 3)?

A. $42^{\circ}$

B. $48^{\circ}$

C. $57^{\circ}$

D. $61^{\circ}$

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100#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lucite has an index of refraction of 1.50. What is its critical ad(5dd- rw(d9c dag)v5;mibl u8m4bwo ngle of incidenceddrcw-b9 (u8)5v;md(ldm wb5 oida 4g?

A. $11.6^{\circ}$

B. $15.4^{\circ}$

C. $41.8^{\circ}$

D. $87.4^{\circ}$

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101#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optic fiber is made of clear plastic with index of refraction of 1g.kul4ych f)7ixvi5 3 .50. For what angle of incidence will light remain wit4)gcv57iikf x h 3u.ylhin the plastic "guide"?

A. $>23.4^{\circ}$

B. $>38.3^{\circ}$

C. $>40.3^{\circ}$

D. $>41.8^{\circ}$

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102#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The critical angle for a substance is me4/xgo.3otv t1do+l yiasured at $57.3^{\circ}$. Light enters from air at $45.0^{\circ}$. At what angle will it continue?

A. $34.7^{\circ}$

B. $45.0^{\circ}$

C. $53.7^{\circ}$

D. It will not continue, but be totally reflected.

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103#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from air at;p.eu3te1 +xhh) bvvk $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 meter long and has a diameter of 20 mm. up /w*f 5*43zkgwdw jq Its ends are perpendicular to its axis. Its index of refraction is 1.30. What is the maximum nuwqjf*/w* d3kpuwz4g5 mber of reflections a light ray entering one end will make before it emerges from the other end?

A. 42,000

B. 26,000

C. 24,000

D. 18,000

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105#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed 40 cm in front of a 20 cm focalaaa.6si e f8b4;ki w/zw)q:v u length converging lens. How far is the image of this object from thefav ib4ak8;i )z:w6ews/ . uqa lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lk2l*y ::ciec jwx8e9bens with focal length 4 cm. Where ick2e:ci:8w bx yj*l9es the image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a convergingvift/1re 6m nm1(((fvboi9cq lens, and the image is 4.0 mm behind the lens. What is the focal length of the lenst9ifm (1vrcv n6oif (q(1/bem ?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm from a conv4y 5rxsnmy8wn+y7yp 9 erging lens. If the image is 4.0 mm tall, how far is it from the lens?y5psm +n7y9xynwy 84 r

A. $14 \; mm$

B. $8.7 \; mm$

C. $1.4 \; mm$

D. $1.1 \; mm$

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109#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is 40 m in front of a converging lens the iykjhx4 p 261zonverted image is half the size of the object. What is the4 zpkh1 y2ojx6 focal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging 7pmr tpj .w7i e,9/dn68vdm tmlens with focal length 5.0 mm. Where is tp7i dpm .7r v,w9tetmjm8nd 6/he object?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 10.3 cm from a converging les**f2 khbyuzarp 5,t0h3vm( bns. The image is virtual ana5b **hrs3zkuy,v2 b(0mhptfd 6.2 cm tall. What is the focal length of the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm fxs2oy.rw u eqm/pl8a,pr8: a2 rom a converging lens. The image is 4.0 mm tall, and 9.0 cm from the lens. p/8,a.:x m p qrowau8 2l2eysr How tall is the object?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm from a converging lens, i25 kmet:l(s0ju)w 5 gjw cr*klt forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm farther from the len5s: l5je(wj2gmr )ck*ku0ltws. What is the focal length of the lens?

A. $20 \; cm$

B. $30 \; cm$

C. $40 \; cm$

D. $42 \; cm$

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114#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 30 cm from a thin convex lens. The lens h:n/syk ;d *(bp1v ohqlas a focal length of 10 cm. What are the values, respectih/ ;blp1sd(ynov :q* kvely, of the image distance and lateral magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a divergiebj2wn 5xb/0s ng lens with a focal length of 102b5x 0jnbsw/ e cm. What is the image distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a dip( j pmf :cnk;2n.r(0qvi:qhu verging lens with a focal length of 10 cm. What is the magnification? rq.:knf j((ip;: h2p0 nvumcq

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in front of a diver4ed8.ad mdnb 2 2*o lfne7rnh1ging lens. The image is 4.0 cm fr d*bham2nnf2rne4.le7 d 8od1om the lens. How tall is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and is in front of a dtg rb2epd(mkl3u0u ; 3iverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. 3tudgbr0e( ;pkm 3u l2What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distp7mb bt00njneq4 hz -8ance of 40 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, 4h jbqn8pnm-ze70t b0 on the same side as the object, what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal length 50 mm must tmk3g*t+ i5km qu-j:rp he object be placed if it is to form a vi-i k3q uktgr pm:5+*mjrtual image magnified in size by a factor of three?

A. $33 \; mm$

B. $42 \; mm$

C. $48 \; mm$

D. $54 \; mm$

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121#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a 50-mm focal l mw 7d)vb5;) (+oeaymdzm i(jcength lens, such as is used in many 35-mm cameras, must an object mzc+dyw) i ;m7m(5)vjebao(d be positioned if it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with 0n sr3m t y/vi.1;qcmifocal length 20 cm, are placed in contact. What imqtc v3.mnsy;/ 0ri1is the focal length of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of curvature 46 cm, and is mq d 2-hhfch i z7w/g6er;7fmm1ade of glass of index of refraction n = 1.60. Wha 77fh 6;ig czd-r/mhf1qwh2em t is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.eqeptf-2 8a5u.jth5 ; : xbhby50) has a radius of 40 cm on the front side and 30 cm on585upbe;h:bt tj-2. exqay hf the back side. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70). The rq9hae,bj0mmr9zj f4( adius of the front surface is 20 cm and the radius ofe,(mz4jmqhafbr j990 the back surface is 30 cm. What is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length of 40 cm. It is made of gly:m, dz4z/70xi lauau ass of index of rex/4 ld,7a 0yma:iuuzzfraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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