Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of im 05eydo7vhv.pi,jf rg s 5cw7(ages by mirrors and lenses has been successfri5hs 5.cpve wdgojv,7(y70 ful 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 incidenck.s2g6ura w2 3k7zs rge

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 mirrorsp8y :bmsan(v 3rb, b.mt(sfc p4(5m oj 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 that iv/vawah(n79a,;w g wdumd*l,1eh d2 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 s6+slxk5ms 5r 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 pasr;b s 7kz1l*gbs through the image location, and would not kl *bsb1r7 g;zappear 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 light rays pass atw;i5+o )g80uq bqv pthrough the image location, and could appear on paper or film placed at the that loq0btavo;)q5 +w8p ui gcation 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 virtual imag 06-sv f)uzhz9x l.hwpe?

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(vhy73ucfx -0q 8dz rj surface of the spherical shape is refer3z- 8jf vd7x0uqyh( rcred 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 tag/.vp rib+y8d; rz9agkes place on the inner surface of the sphere is referred to a r ;g/pivy gdr8zb.a+9s 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 conhad 8dq dth7un mo4()hp k :***v,gvjhcave 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 par8 hf/xsbu(jvl2 z0d k,allel to a concave mirror's axis, strikes the mirror's surface near its midpoint. Afjv,hf(kbux/8z 02l dster 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 parallel to the tj u(zup2,n(cii 63xp8eaj0 i 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 mirror';bt4)kufy1)lcwku syl /rug c 5m 7;)is axis, crosses the axis at the mirror's cent) )cwsyg; 5 )7/fkulcimlb ukrut;41 yer of curvature before 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 path through the center of curvadhdxj:xsps4 1afzv9ob2i4+lo-j ka1 hrh-69ture is rx6ajsh -xdbhikr91 + o4o4 jv- z9sadlpf :2h1eflected

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.vy oc7ayy+ h: concave mirror's surface, crosses the axis at the mirroryo7h:yvc y+ a.'s focal point before 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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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light arriving at a concave mirronpc9 5gbth9+q :wd m:hr on a path through the focal point is reflectech gqm::pt+995 dnhw bd

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 forl7wyil c)lrof7bd 00 )b j*6yo finding the image position due to a curved myy d)ow lflb0lr ic*b6)0oj77irror.

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 fous3ss7c3 0k+ 2igjfs zcal 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. Thxidacazc/vzi099g z. :hg ()*u 0e8nq sxedx:e image produced by the mirror 9zea8/:i d0iu qzhgz*s9:xxexag.cvc)d ( 0nis 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 mirrobw)gepz/t kl; (ai; o0r's center of curvature and its focal )z wie/l( 0op;at;b gkpoint. The image produced 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 miivibt. oivs8 : rn6)sh+/+n1stza 9 lirror's surface and its focal point. The image )zli:aisvn+9bo inh6s1+it 8/v r.ts 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 samhag 2u/l;g .i7wnn/:vbavy2y;wvg n (e distance from it as its radius of curunh ;nv iy w n;(g22g:vabg7a/lw. y/vvature,

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, at the same d,gvh cz8:6miw istance from it as its focal length,w iv8z ch:6m,g

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 magnz0y9f8 e -yel6+yxno iified image (a great big you) and sometimes you see a diminished image (a linlo-+0y8 z9efx eyy 6ittle you). If you look at the bottom (convex) 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 mirrorzdx3lu hc;c ,*s 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 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 imq / orgs* jp0sg357tfnages 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 mirro3q v: ltbq6;dir 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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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single convex spherical mirror produces as ppl l5-n0bjbw cht 9cv.;8.hn 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 magnificatio*:bg e 8wccl7zn for 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, th8fe1u, wzp 4o:t9ysrve 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 neg q.0i fch8fbr5ative, 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 imag/fpp1jj: 3dmze 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, the imah .x cifey/-u1,n6bddge 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 larq xx..fr 0fe38iulx,9rq yywz;zl4. e ger than one, then the image is.zr8 3 u0.frqxi,;qyy xxe4lez9lw f.

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 magnificatic u6cca /mf.bet+kzeg 01vp7,on is smaller than one, then the image igbc7 .ce0 ka6/pzt+,c ev 1ufms

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 oi b8ba2s06 qdane, 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 fastestu.6a3ts:ak 7t01 dq go: azisw

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 substancess(91lgk8rc*j:sf )nsg ik,e qn/.zlc , 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 one for a m7v:) ogrc- qy +lbv,vdedium 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 refractisrq3 xjymuy :ss3t-/,on of 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 incidence,rn0q/;hvty)qg9 s+h gzyv5rqrar * *.dnk g1

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 denou47h5/lnj qdj): sf yser medium 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. 7wq1i2,jx ulfThe 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 at 3hu xb 2(onbz2a

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 based isb1 v0t c-7ereg+oi4it ,lrkj,*mnls6ni7 5yl

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 water into air isr9* b4wfg/1ifrjd7/gn 7hh tt

{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 workrf egmml)iw;s 6si +m10db. l2 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 cente ka,pbh 2fxcz1.2,tv w*9i 6slis/d jer 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 than 0sn5(6o u)s jrob dtp(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 atjuv4dj)k 26fni7ygx/y 1 4 etq 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 similp8cjz6z*zvp 9ar except that lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters zp96pj c8*zvz. The 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 gtm1k7f 9 pb:mp(vv,e +nhdx 0the axis of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely tpht0m +9xmv1,fn:e d(g7bvkpo 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 lens, strikes the jehrjh ;le22 dx q-vd-x)v/ d*lens near its midpoint. Adq /r -jdx;2-jdhev2 )v* xehlfter traveling through the lens, this ray emerges 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 findi xle pbw)68ib2ng the image position due to a thin lensxb)6l2ipb8 we.

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 length ,.x mnrg9; m jrlqoc94

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 focalm:n 1nrqnr8gt,os/ -r length

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 lengthxo*,6(9 )ck3t nr des7 s vyy-cjna2ripm +g.g

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 focal lengotwmtbie*x; -m-t6 f; th

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 focal lengthr- 1bvz p0em)gah, 4v2s k.ywe

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 a convex lens and its focal wj vk77pp 60*f+ lu9*dx4weiyp3tgompoint. The image formed p76imv xl9dw ppo * etj +fgku43w7*0yis

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 con-emy,u qfe6kv ac 8s1qo2pr /:cave 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 yos+7a q*4dmcve u see through a magnifying glass 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. Betweeli ,,pij ;ln /:yxy(cun the lamp and the screen is placed a converging lens of focal length 24 cm. The filament of the lamp can be iuc yy, x(jn,;il:p /limaged 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 lengoj + 7pd(;nveaths

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 vw+uqh 8 b/b;dyn6u t1placed in contact. If each has a focal length of 20 cm, huvyhnb +;6d18btwqu/ ow 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 with an angle of incidence o 5;r 2;v ysz9ijzr5qwjf 5rwvij;5qry zzs29;j

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. li;qeb5c0v) zw r27kp The image formed by the mirrki)bvl 70rc z2w;5 pqeor appears 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 image when you stand 0.75 m in fronxsq5 :n6sdm/q -d /a5qkqx/kbt of a vertical plane kq -/5q/mnbxxskd/q5sd 6:a qmirror?

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 ap niixwnamt)y 4g rl.-+*xvq5. proach a vertical plane mirror at a spee*5nqx) ga4w-t +.myivxl inr.d of 2 m/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 rc.z0sy5q (ul c9hfs *far from the mirror is the crq9yzlf.*cs(su5 h 0focal point 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 image 30 cm from the m:l8e*p j jw:fb.qwk s5irror. What is the object lbf jw8*.w :psj:ke5qdistance?

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 concave mirror, and th:,yw*/ z-pz k2,o zwlwibt4rqe image is 3.0 cm in front of the mirror. What is the focal leng,orp2z zwt* q,:w i4y wklzb-/th of the mirror?

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 a concave mirror wi y0xxgh/ x 0n51ed9dlpth focal length 3 cm. Where is the ima1pnxhd x/l5yxd09e0 g ge?

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 hww f 7ok:+liu72qpc2y :5q jzbas a focal length of 20 cm. An object is placed 10 cm in front 5:qu c7 bw +wkfqo pi7:jzl22yof 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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77#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave spherical mirror has a focal 3ib-2-g*;c3gprhf:jmr neh g length of 20 cm. An object is placed 30 cm in front of the mirror on th h gg;c-3f 2rijhbgr3e-mn:*pe mirror's axis. 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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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 tall yjr3(kn 4:ko- 0:f4-wtmya bkkl4 gex, and 10 cm from the mirro-kty0: y kfal- 3xb(gem:r 444kwnjkor. 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-r w-db0m ukm*h2 npghi9s(s; of focal length 20 cm. The object hbdkw i-r*0p2mghs ;9 m-n(usis 4.0 cm tall. How tall 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. The i*. j wbncj/b +c79wgh.qhg et3mage is 38.6 cm tall, and 14.8 cm from the mirror. How far is the objeh7 w.g.njqh9 3*e cbtj+g b/cwct from the mirror?

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 copqs5pt p .v-w98 bhi8i5.fgonncave mirror. If the image is 4.0 cm tall, how far is it from the hp.vs.p88-q 9f nitigw p5b5 omirror?

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 of focal length t e3r 1xa 7mtknu3 ;rtgs7*u:o20 cm. The object is 4.0 cm tall. Where is the imagrgn1tt e7 :uaok*mt7x;3r s 3ue 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 f b0l7a j/gu (-dvjbr8xront of a cosmetic mirror (concave mirror), the erect image is twice the size of/ g(0b bvxr-d8j7lauj 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 sh(bn af(ydo,2 baving mirror. If the image is an erect image 1.5 times as large as the object,fona(db b,(2y what is the mirror'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 mir(up)7ftq(q*n ;a3v) lfza hho ror with focal length 5.0 cm. Where is the o;)(nhol)3f*u aqtzhqva p 7f(bject?

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 focmlhunfe. srw+,w(e/ kzm3o -.al length of -20 cm. An object is placed 10 cm in front of the mirror on the mir r eh(3o.nf k ,mwse+l/mw-zu.ror'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 focal length of -20 cmvcrlw -/:nn0awcfdb.0 (i.pqbdc,x ( rx7kt ). An object is placed 30 cm in front of the mirror on the mircxi0v c.)btww (7nnr.-0(f rbd,: d/apqlcxk ror's axis. Where is the 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 5.8 cm behind therf6z(g5w /wsa mirror. What is the focal lengthr 65wzaws/( fg 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 conv ts5jrzd( u.*-*uiscqlf3kar qu:5x ,yn ;w)uex mirk5snj( 5du3r: ;aflcq,yz t. x)-q*us*wruu iror. What is the mirror'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 the speed of light tomuq x8b0 oitjo)a7jrlq2 1*1 hroughjqrubj a*0o)lmi1 q28xot7o1 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 incidenm73f0 ( 2afdsz-y aht/ypb gczt. 8k.xt on an air to glass interface 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 from air at an anglesikpoe0m+fgk . u;v v5r,47gk 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 w93t0l0mv9zn eu.i ywz /8niy gater. The 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.qi9y2l (cw-gyqewz4m g3 d.0e0 cm thick is spread smoothly and evenly over the surface of water on a winez.qc -gw9w(34q02edym g iyldless day. What is the angle of refraction 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 pond of water. At what ang. q22jygdk gd-le must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The i-.y2dgj qdg2kndex 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 of transpa9n:ghwui3 c0o5.tcoj rent material at an angle of coo5 9u gh .3cji0:wtnincidence of

{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 in/9wu*ya lp1 tbcident on a slab of transparent material. The incyb1/t9 pa*u wlident beam 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 pasleyh+9h qbbd7 w /j*;dqb2d(using through it at by 7quld(dq*/ewd9 +jhb2 ;hb

{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 lixmrkyowh*8bh( c0yy2*cc w ;3ght traveling from crown glass (n = 1.52) into k2m*xhh8c ;w*03(yryboc ycwwater (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 1.3 vjm ;vrs tembz1q1:odd:9u250. What is its critical angle of incidence?1zre 3s:d9:mu bt;v dv jo1m2q

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 pkm,sl8jj )fd8 lastic with index of refraction of 1.50. For what angle of incidence will light remain within the 8,sd ljf 8j)mkplastic "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 measure m 69ufj:gav y1gjq0v)d 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 ata94qgjzsr wtl p(.z/z d,c m (a2q4u:ir 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 mejw* ngg6.xzqc8a ogfjv;. k7(ter long and has a diameter of 20 mm. Its ends are perpendicular to its axis. Its index of refraction is 1.30. What isv jn*c w.ko;76zggj(8 .gafxq the maximum number 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 focal length converging lengt, vm:)9 zp6voz1 axtz h.c3bs. How far is the image of this object from the gzh 1xbv 9m.3zo ,zt tvc:)6palens?

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 iy2y, hi2w4fqgkzo,*p n front of a converging lens with focal length 4 cm. Where i hw q2y,zk2yg*,f i4ops 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 convecb1yh7)tn 1 18mnv lesrging lens, and the image is 4.0 mm behind the lens. What is the)yemnbts1 c1 1nl8h7v 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 isu9d/0w1amk 4bfpo* lj 4.0 mm tal uw1lma*p/fbkj0 od9 4l, how far is it from 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 40 m in(s ew t* ep3g 285hy3lsxart1r front of a converging lens the inverted image is half the size of the object. What is the focal length of this lene3g2yp3 (wesr51s * tha l8txrs?

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 xmfszlc* d *e+,v-ni ukoho* 4q )97zkof a converging lens with focal length 5.0 mm. Where is the objec uvo)z +n94f*km sx 7cl*-qh*dez ok,it?

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 6uqk famhs5zf*1p( syh+irhze (5,m010.3 cm from a converging lens. The image is virtual and 6.2 cmayh(, rkm+*6 s5fzz h ph1f(mu 50qise tall. What is 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 convk pxdu(u.7 anjes vq4j9) 6.l*ckx x,nerging lens. The image is 4.0 mm tall, and 9.0 cm from thenk e.uxac(j ks*.9uxp) xd4vjn7 ,q 6l lens. How tall is the 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 from a converging lens, it forms a rgh hsq.q5bj+3 dcoyr5l + 2;noeal image. When the object is moved to 40 cm from the lens, the image moves 10 cm o+yr3.jb qnd sq5l +;ohc52ghfarther 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 distance of 30 cm from a t (e0-tsmu +p rh (ev58i8y.i; ptkaodwhin convex lens. The lens has a focal length of 10 cm. What are the values, resd m85ik.( (+tvopi8sywe ea t-0hr;pupectively, 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 lensh.u ,ijkjp/9 f with a focal length of 10 cm. What is the image difp.i,hk/uj9 jstance?

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 lu:(y d9ub6i0,d0 u acf9wznf focal length of 10 cm.a :0fl6yifcu(w 0 ,dd9z9bn uu What is the 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 divefs 0xekk , wuh+,1v+.ue4uth lrging lens. The image is 4.0 cm from thehs+tu,0ew 4+ kxef,.uuhk1v l lens. How tall is the image?

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 ot-c 9yd1g,gt v;ot1 +oy7c rltall, and is in front of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focy1l vctoyt1;t7od+-9,r ocgg al 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.pn0ra1)eo jb q.,wef - If a virtual image forms at a distance of 50 cm from the lens, on t or.wen j)beq0 -f1pa,he same side as the object, 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 mm must the object be9fpl x;,.nfce 0)r4.a7w :3ynrc gzxo r3 jjgc placed if it is to form a virtual image magnified in size by a factor on4cz x.7yofeja)pg3l. c,n rw;grjx3 :0c9frf 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 f8dfr*4h ( js5a pqmi2yocal length lens, such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified idys 5 ifqh*2a 48(pmrjn 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, each with focal length 20 cm, are pl5rx +:fl me(caaced in contact. What is the foca+(:e 5mrx flcal length 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-convex) thin lens has radiq**wb4ncvw ./ itx no* *od+jzi of curvature 46 cm, and is made of glass of index of refraction*/* zcxt+*.ibv* nqww4d jo no 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 frou,k)zc :k9s( :juykw gnt side and 30 cm on the back side. u gwyz) jck:s:kk, u(9 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 of plastic (n = bv6 8w* 6c o07dgz 0bbvjhypu,1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cvvu0 bb0*6 cjgd7h8 pz ,6byowm. 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 lengtdfg6+6jv0 dmt h of 40 cm. It is made of glass of index off 6gd6dj0+vmt 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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