Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, .(ginnpo1sxdm/to 05 and the formation of images by mirrors and lenses has been successful desc 0dns nmxot1/g(5.pio ribed 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 incidenk n+y upi9hy-i2h0js ;ce

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 mii mu yg)98vu0reizf71 lg;x 2c3yw /klbei: g9rrors 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 image thaoi q+qu qo/075x3 cnprt 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 imagy)- hep zal2s3es 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 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 iho3v vwx;qg/m )/fpn-mage location, and v-3 mx )ogw;fv //hpnqwould not appear on paper or film placed at that location is referred 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::l7ry8coc x+ yy3 trs )d0lzd light rays pass through the image location, and could appear on tz+ 3l yd8sc):ylo7:dx0ry c rpaper or film placed at the that location is referred to 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 a virtu05geb t01d*i 3 zvtocn.gzg2r al 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 o6x l4h 2usu4tcf the spherical shape is referred ts4ucl6 24huxt o 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 7*, s : pgt)vzgvegx4qplace on the inner surface of the sphere is r7t ge ,:4p*v)gqgz sxveferred to as 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 of the concave mirror is r, the focal length w(; cadcnk;1bis

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 parallel to a cal5fhcm1;562oo zd g soncave mirror's axis, strikes the mirror's surface near its midlgod6c5m h5a2zf;1 s opoint. After reflection, this 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 par;tkd ;h2iw9oballel to the axis is reflected

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, traveling obliquely to a concave mirror79:4 r;gp6skykkdrc hme b1mi e)wx22's axis, crosses the axis at the mirror's center of curvature before striking the mirrokxm1 h:dc64 7s;gykm i 22) r9bepkewrr'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 m)p 7 .ik;cuswa path through the center of curvature is reflecte;iu7m) .ck pwsd

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 p.h. saze4c4 x-fa,glmirror's surface, crosses the axis at the mirror's focal point before strikp.a f4, clh ex.-4gzasing 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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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mi tajv loyr8 ,f+q7g3yzz4 f6td6pi90 orror on a path through the focal point is reflectedz8a3ov6frit,yz+6 dt jfy qp7 g049ol

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 o zheaccg/* 2 cu-enkx,33hn6 rays for finding the image position due to a curved mirro acchc *ez33gu,h o/e6xnk n2-r.

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 at its f +syjbu3e0)ub;2 gxp0 d/dyq gocal 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 curvature. The5sj 7y zau2xk*(i8 gya image produced by theajzs2 *a5x (ygky8ui7 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 betwev-bajciu3 8x5pg6n rk2e/x6qy h8 8 bwen a concave mirror's center of curvature and its focal point. The image k58cghuxj2vnb a8 8-iqp 66 3wby/exrproduced 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 conca ha,e y9* ercdln-u09rve mirror's surface and its focal point. The image for-r *nd, erca0 yhe99ulmed 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 a f0pmi3mqm dw7 f*i81distance from it as its radius8 fipai*fq1m3w0mm7 d of curvature,

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 mirror,uii89f5mpo.fb4 ukj3e+2o mt at the same distance from it as its focal leng +of3e4timb iu.5of9p28jum kth,

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 magnified image (a go)p efuc:, /b4q pzpr3reat big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what will yo:,rz3eo)/4q bpfpp cuu 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 producfir8 qd .i* ywpj4k r:gp0ix67e 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 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 lk9) y ydkeoqn,t3+e xk2t(+sl/we b+produce 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 ):jdpa;: omkl5jkw9r 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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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirrhrv :iigq1;18agr -xy or produces an image 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 fou5k k7 nf1y.gs k(hzr3r a mirror 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, the image form* j8j 5qtzoj i,+/no:fljj3 tved 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 negative, the image fojr w8j7gvh(1 y2wyw*rrmed 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 e ww2uxcn( 24n08wd/3vko kqw image 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 a negative value, thes-7tw fvvu1r 0 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 of the magnification is larger than one, then t7b)2t1wbl vbojtsz x 341 ntt5he image isbb513xz2 jtb4o1t tnvs)7ltw

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 magnification is smalfbfc3v4 z5hh1s0.phvler than one, then the image is zh50hbc. pvsh4 1ff3v

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 one, then the im41-v)k t i+dmfk3cmemage 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 fasteswpxy,3b.ff5phy ix8 6t

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 substances, the index ofbpbndf47 1 l-(8g lsxv,ay*ex 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 one for a medium,2kv7ghr29x5ucug ;rbp qu8j 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 zsfjt/pqb4: )ra * ro* s(3pe*uc/lz kof diamond is

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 incidencea sgxc87i) r1xyl o6w,

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 medix.bj3jz wk/wu9)xco kn)(3 q sum is refracted

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. The angle of refra)zme:p 2g4wb klbq3q1ction 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 pla, xnomw :c8+ 7 /y7jx/xpisvp8vz9e(lhtfa b)te 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 optics is osiqs-c/j7y ,vl v*t8 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 fr a /tbz60y7.(pff tbt i4*whuvom water 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 lens .sdf+ p8a+obivg33 vwes work 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 thickest at the cenod36)0tj p +rl-e hbovw7q ru9ter 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 te*t iq; 2cbb-)2jar nthe center than 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 at the4h: xk6ee g2zd 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 exce l3ah,l:lb* x u osz7gat1(dvrnnjy;.fmt 0(5pt that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. Th aj0rv5 b:(37ulyas(om.; x f zl1lnhnt* gd,te focal length of lens 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 axis5u;* a avgp0mj of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges trapau;0m5gja *vveling 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 of a convex thin len zsr3 *uy-bv-p4l8isss, strikes the lens near its midpoint. After traveling through the lens, this ray e-siyu sbs8 p 43zl-v*rmerges 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 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 rays for finding the image position due to m yxssmedm/)qd* a- y. sltu+y82 6zh/a thin lens.q. sd+lsza8 /m6*h)ty m/yx e- m2ysdu

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 fa y2 5daqrrp02z i*b3length

f

. An object is located at infinity. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 leng( 3s hc s8:2*rwz:d;lvtlb7 yxv+usre th

f

. An object is placed at

f

on the axis. The image formed is located

A. at infinity.

B. between

2 f

and infinity.

C. at

2 f

.

D. between

f

and

2 f

.

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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 leniax 7.boc: :djgth

f

. An object is placed at

f

on the axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 foj4mf zk3 1)jzd.ylz (vcal length

f

. An object is placed between

f

and

2 f

on the axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

C. at

f

.

D. at a distance greater than

2 f

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 focad/;mzf :.d ljwl length

f

. An object is placed between infinity and

2 f

from the lens on its axis. The image formed is located

A. at

2 f

.

B. between

f

and

2 f

.

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 aq1rd:rok3q4k eka ujspdt/06j)u 4 t 1 convex lens and its focal point. The image formed so6 44kj0:dtpj tu qer/31)rka1kqd u is

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 jw5jbhu d90ak-,e b/m ynv u(/lenses

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 glasmh62pmnu 9q7 ss 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. Between +uxodgx-0zddrx4a 0 6the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can bx4d6 xgr0xzdu 0 oa-d+e imaged on the screen. 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 focal lengx6 9oeeo,cvjtf9sa)a.gc l3: ths

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. If each hc*vr+x 94hixz6fy ,xbas a focal length 4v ri, x9 6x+yz*bhfxcof 20 cm, how would you expect the combination to function?

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 c m

) is positioned 2.0 cm to the left of a converging lens (

f = + 6.0 c m

). 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 plane's reflecting surface hs/w fl ch7:eub pr06-with an angle of incidence of uw/6cl f- 0 ebhr7s:ph

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 a plane mirror. The image fo dpz n36hc9pc7zlo*k0 :d5m iermed by the mirror appears t9z on le*c650cdp:zk7m3phd io 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 image when you stand 0.75 m in front of a vertic dm:u7g)z6 p.rg ifv0hal plane mirvgf: izm.0 gpr7)u6 hdror?

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 when you appz :joeuj)j:9 oroach a vertical plane mirror at a speed of 2 m/:ujz:o j 9jeo)s?

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 has a radius of curvature of 20 cm. How far v6ahs.ug a cadus,90+from the mirror is the focal poin+c uud aa0h6ssg a.,9vt located?

A.

10 c m

B.

20 c m

C.

30 c m

D.

40 c m

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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 imamt agdrfu4lx8 +0g*k0 ge 30 cm from the mirro+kt f8* rlgdx0au04mg r. What is the object distance?

A.

20 c m

B.

15 c m

C.

7.5 c m

D.

5.0 c m

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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 front of a coi2.ec00dvb 9dtf+j2u rk. uks ncave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirro0c22u .b kkiud0 sjte9d+ r.vfr?

A.

15 c m

B.

4.0 c m

C.

2.4 c m

D.

1.3 c m

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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 h5g;-pi beg vp9rgr8*z;4hi ca concave mirror with focal length 3 cm. Where is the imagvpg5i-hgic* 89phe; 4rzb ;rge?

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 yntg /c(n su me:0d3mf(6z 2mm4ay3 dnlength of 20 cm. An object is placed 10 cm in front of themtamsfm36(4e:md z/02n(ny c n y du3g 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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77#

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 is pl8g 8 a +t/ v3fi*o/hjefgxsm4taced 30 cm in front of the mirror on the mirror's axis. Whehitgf8fx4+38a g oej/* / vsmtre 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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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. The image is 4.7 cm tald6ef+ran/r0s e5x . sel, and 10 cm from5aexn .fs0es/6r r de+ the mirror. How tall is the object?

A.

12 c m

B.

11 c m

C.

8.2 c m

D.

2.7 c m

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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 len n5t,al9ir5 bh ldxz/j,gs.4 zgth 20 cm. The object is 4.0 cm tall. How talll/5zhb zn 9 .,atl4xgij,r sd5 is the image?

A.

1.0 c m

B.

2.0 c m

C.

8.0 c m

D.

16 c m

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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. Thnsix(,q ;sh ,t4/txu xe image is 38.6 cm tall, and 14.8 cm from the mirror. How far is the object from the m4,qx(xxhn ,s/ tu sit;irror?

A.

124 c m

B.

47.6 c m

C.

18.2 c m

D.

12.0 c m

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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 4.0 cm from a concave mikwe.606,xhd p-bj0og *y hxqlrror. If the image is 4.0 cm tall, how far is it from dh6e6p0b.qk0x -lo w,*hg xyj the mirror?

A.

11 c m

B.

9.4 c m

C.

1.4 c m

D.

0.090 c m

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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 oei;,- voqs*7ik v/db xf focal length 20 cm. The object is 4.0 cm tall. Where is the image locatedko;q-*d x,ibvv e/ si7?

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 c6dztgesm.rcb o+a 7: (*l prn*j0es+wm in front of a cosmetic mirror (concave mirror), the erect image is twice the size o+rpajs0b gzr*wc* te d n6.l+mo7 s:e(f the object. What is the focal length of the mirror?

A.

27 c m

B.

40 c m

C.

80 c m

D.

160 c m

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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 of a concave shaving frf *)7. i jzdqmuzgz2h9j p-*mirror. If the image is an erect image 1.5 times as large as the object, what is the mi-29 if.mz*7*ujfqz g h r)dpjzrror's focal length?

A.

20 c m

B.

50 c m

C.

70 c m

D.

90 c m

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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 behind a concave mirror with f5ju-i j19thyq ocal length 5.0 cm. Where is the objecth -j9 5jyut1qi?

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 -20 cm.wk qnu(dx-v58 An object is placed 10 cmw8 xqkvn5 (du- in front 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 hat+-1x zmz p( 2cbifr3os a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the i xb2pmco1 zrf-+3t (izmage 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 5.8 cm behindoup, h;wj6-bb the mirror. What is the focub pj,ob6hw;- al 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 a co/c*kqcm v;, figm0w 5pnvex mirror. What is the f0 /*cig5 wqc,pmkm ;vmirror's focal length?

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 index of refraction of 1.50, what is th-kf8o 3 cfki+bjrz7 z g7l7 *fnmr3ke3e speed of light thr7 k37n m kko7*rfirj- fzgl33ec+b8zfough it?

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 interfac.rdgrp+kr5)u au0va :e 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 frome of3tr9io )l8 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. Thb7sr3:f5vk h-n n9snu(8z( kprmcg- le incoming ray is at an angle of

{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+om.d 4 h7a wzco-zgo/ spread smoothly and evenly over the surface of water on a windless day. What is the angle of re -d7oc zw+go.azmh4 o/fraction in the water 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 surface of a still f++ ioyv 7phv*pond of water. At what angle must the diver shine a beam of light toward the surface in order for vi *pv y++foh7a person on a distant bank to see it? (The index 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 air, strikes a plate e lr 1e(4ciy;a pk;n4mof transparent material at an angle of incidence a4epc4m; k r;lie(ny1of

{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 air is incident on a slabgj2/s :rqhqy . of transparent material. The incident beay rj/gq.sh:2qm 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 of refraction of 1.46. Light is p d8pt5y*asefgp,zx( j +l z6m7assing through it at ,6 gaxm(z*7 pjd ftl+epz85s y

{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 ang 8q96qykdjwv,.w/y;b*vwya dle for light traveling from crown glass (n = 1.52) into water ;v9vkdbqj .yd8ay y w/*w q6,w(n = 1.33)?

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 angln6bca+i )eyh81(a rnp e of incidenr)b8c eya a6pih+n(1nce?

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 refractu-p2ar 7fcr 4zehe., xion of 1.50. For what angle of incidence will li4e r2fczpux.,7hr ea-ght remain within 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 subsns;n9zho j6 -ytance is measured 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 substantigde ( qes8qj .t4e,f(;rrj(ce from air at

{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. Its ends are p3l7skh r bg k+ook;)i6erpendicular to its axis. Its index of refraction is 1.30. What is the maximum number of reflections a light ray entering one end will make before it emergesro+3 ikh 7o)kg k6bs;l 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 inwz zguh)-:h ,;c0u c+cy8caf1vqkzn+s;w xj+ front of a 20 cm focal length converging lens. How far is tg;zkwuy0 cc1x+cqfnc whz+ uvzs 8)h ,-;+aj:he image of this object from the lens?

A.

40 c m

B.

20 c m

C.

13 c m

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 lens with focal len4qb61xn laxj)gth 4 cm. Where is the imagex6 qla14jx )nb?

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 converging l4fs2 c+ 1dsmktens, and the image is 4.0 mm behind the lcd s2 s+k4t1mfens. What is the focal length of the lens?

A.

11 m m

B.

5.5 m m

C.

3.8 m m

D.

3.2 m m

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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 converging lens. If the image is 4.0sx8eb-(kvzt)x xrfp6 zhx(0a82 q5w w mm tall, how far is it fr)vk6x px(r t- z8fxh 0wqxe8a(bws5z2om the lens?

A.

14 m m

B.

8.7 m m

C.

1.4 m m

D.

1.1 m m

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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 407(kj1 ar/*ti b,j ; (vhvbyiw3vr2hdt m in front of a converging lens the inverted image is half the size of the object. What is the focal lengivt bvr3 hik2ba/,jvj* ytr ( wh7;1d(th of this lens?

A.

13 c m

B.

20 c m

C.

40 c m

D.

53 c m

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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 convergin*dio 7fmbtcr g;+a4y4 g lens with focal length 5.0 mm. Where is+c7o*g44my ;tad bfir the 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 conv.sgb8q5zn-n cerging lens. The image is virtual and 6.2 cm tall. What q8sn-ngb. 5zcis the focal length of the lens?

A.

6.8 c m

B.

10 c m

C.

16 c m

D.

30 c m

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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 from a converging lens. The image is 4.0 mm tall, ho-c/ / *f1p pivagnd e0t7,sfand 9.0 cm from the lens. How tall is tce1dv/07- ,ipo a nfpsgf/th*he object?

A.

6.8 m m

B.

5.4 m m

C.

1.7 m m

D.

0.68 m m

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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 fro, 9qmp2s.7zt yo.eh9aukav* dm a converging lens, it forms a real image. When the,u2.p* ov tz97 .hyq 9dasamke object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of the lens?

A.

20 c m

B.

30 c m

C.

40 c m

D.

42 c m

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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 die(-t;0dr+ ljn3c ,pel-p l fzlstance of 30 cm from a thin convex lens. The lens has a ftpjcz0p+n-l3(el, fr-e dll;ocal length of 10 cm. What are the values, respectively, 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 diverging lens with a focal lengtsy7 snlwxo*6fuualg7:q9s 5:h of 10 cm. Wha:so 9y7q f5gxlu7s sau:w6* lnt is the image distance?

A.

7.5 c m

B.

- 7.5 c m

C.

15 c m

D.

- 15 c m

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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 diverging lens with a focaez 8 rn 1ecz/y7:sez.gt1dj.vl length of 10 cm. What is thezrj.81etng v:/z1cdye e. 7z s magnification?

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 di5(g+0 c,q jpdbw.qxpfbgrd/ 1verging lens. The image is 4.0 cm from the lens. How tall is the g +c/(b .xgp 5 fdwqq0pjd,1rbimage?

A.

13 c m

B.

8.7 c m

C.

5.4 c m

D.

1.8 c m

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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 diverging lens. The image is y,pqnn3i6n )p 2.5 cm tall, and 7.5 cm fnn)n6iq ypp3, rom the lens. What 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 distance of 40 cm from a thin lens. If a virtual im/6 u vhiqyez; :du/x+tage forms at a distance of 50 cm from the lens, on the same side as the objecy6u/e+tz:hd/ u vixq;t, what is the focal length of the lens?

A.

45 c m

B.

75 c m

C.

90 c m

D.

200 c m

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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 ze spu*d .ub.x-:1zlg mm must the object be placed if it is to form zlepz-x*us 1:b.dg. u a virtual image magnified in size by a factor of three?

A.

33 m m

B.

42 m m

C.

48 m m

D.

54 m m

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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 length lens,8;qg0zx;uwn m/r:jrp such as is used in many 35-mm cameras, must an object be positioned if iuz;rq:w/0ng;m p rjx 8t is to form a real image magnified in size by a factor of three?

A.

46 m m

B.

52 m m

C.

58 m m

D.

67 m m

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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, eacc afmdl4tp . 2kfu/b(6h with focal length 20 cm, are placed in contact. What is the focal lengthff2b4c/ t6d lu( makp. of this compound lens?

A.

40 c m

B.

20 c m

C.

15 c m

D.

10 c m

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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-coyc-s +m f:;bn 0 zr.c4lg/aupl/asnk1nvex) thin lens has radii of curvature 46 cm, and is made of glass of index of resmusbng:a;pl1kna/c rf0. c4l z- +/y fraction n = 1.60. What is the focal length?

A. infinite

B.

38 c m

C.

30 c m

D.

18 c m

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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 = 1.50) has a radius of 40 cm on the fron+tq dc/3;xyfvd qp,h)3-*2tvf vtdhky 7gf*v t side a;d7 2q3h +3ff)dpgyqh f vxv /-y*c tkdttv*,vnd 30 cm on the back side. What is the focal length of the lens?

A.

11 c m

B.

34 c m

C.

80 c m

D.

240 c m

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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 +, rbov) gsnmq,(vup ,of plastic (n = 1.70). The radius of t +v),ousg, (pnrm,qvb he front surface is 20 cm and the radius of the back surface is 30 cm. What is the focal length of the lens?

A.

17 c m

B.

86 c m

C.

- 86 c m

D.

- 17 c m

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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 c5d sey7 jt,7v0 egw+) nhm5vpr;w.gkmade of glass of im 0w;t )ygjpc5sn.ge ed5 7,7v+r wvkhndex of refraction
1.65. What radius of curvature is required?

A.

13 c m

B.

26 c m

C.

32 c m

D.

36 c m

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