Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of itco ;h(8zv9s7,u nyjemages by mirrors and lenses has been successful descn79huz (,ste 8o jy;vcribed 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 incidence g:o-wdm35/-db c1wo/ ewrjkc

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 whionv3+xs9boo/ab2l ( (m:b* gf5ghgpk ch mirrors 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 oop;w8 / goq)bkrw/j6 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 produch .fqbsyog++r +c-yk6e 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, 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 pak8ls-)jsxwe7 ss through the image location, and would not appear on paper or film placed at that locajl sw- ex78k)stion 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 the4s w y4zu)hn j 48e07dh7mowfl gm00ta light rays pass through the image location, and could appear on paper or film placed at the that location i80eul4safmn04wjw7h ) m 4yz07tg ho ds 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 imapv;trw zbroczk: 690+bv5u, age?

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 o c..oyr1pcbe52a8;*p zugwc jn the outer surface of the spherical shape ; ya2 z 1u.j cbweg85pro*.ccpis 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 wh; wlv3wjxj 2e-zc k/sbk0-8anich reflection takes place on the inner surface of the sphere is referred2/-sk-0ca 3lnwj z8k x;bvw ej 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 curvatur-ujy npq /xhxg,8 -:pye of 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 parallel to a concave mirror's axi/ 2l du;dztql5shg+ d t*g2w;js, strikes the mirror's surface near t2dz2gt5/ ;hdqlwlg; ju +ds*its midpoint. 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 +s qgok1n*9b iin 3th7parallel 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 mirror's yj z4(msye6 rmg5g-m2axis, crosses the axis at the mirrorgy(j -ser46 my5m2 mzg's center 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 xa 0:o jm1/mo+(n0jootu8 gbp 6ou+otof curvature is reflecboo+a60u(1 xtj 8:o0oopmtu/ jomg +nted

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 togewk5hm*h2 g0 a concave mirror's surface, crosses the axis at the mirror's focal point before str gh20kw*gh5meiking 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 mirror on a path througlm mc/g3q5tg :x j:at;h the focal point is reflecte;gtj :53mmaq/: xtlgc d

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 findinx5 13ybp/ sl/iom0bhxg the image position due to a curved mirr3/hmoys x xbpl /b051ior.

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 focalwbax f3vz b+8 ar-p-:r 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 mirrowiuz 28 d;94ngh2cchvr's center of curvature. The image produced by th 2d c29gw hu;h8zcn4ive 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 mirror's center of curvatuur+-yjm5gs0n z l;:cmre and its focal point. The image producedul;jm5 rcng -s0:z m+y 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 mirror's surface and cqkzvu pr+,p2;7b 8yc its focal point. The image formed in this c+7crqk v;y 8 u,cz2pbpase 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 themx3wdn8f )cyf 6n .jz- same distance from it as its radius o.xyz m3-86nnfj )wd cff 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, at the sg2 ux, oqyqc.gs+5aq l;-z/ckame distance from it as its focal len,a;.s o 2q-ug x+y clq5gq/zckgth,

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 magnifiedady 3e1m-edv; pu7,s0l8 v(oa kzjiq8 image (a great big you) and sometimes you see a diminished image (a little you). If you look at thei ;v1d-am d0pa7qzke3s 8v yjeo,u(8l 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 mirrors produce im 1npuz1upe8uvaa9 x;,ages 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 images whqv pbw8-iz)m ,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 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 at6fkf 659 hc-odg m0 y bze3(gf58pxokn 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 sphericalh(/y3q h+ qs1k erijp- mirror 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 for a mirror m k,;inr2.el oylwoh2pn:;h- q eans

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 ii-zxl2 +:qogjcxu 4m5mage 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 negative, the imakyaku:7f tk+zbun3 e.*,v qa;ge 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 i8j793e ghi qz nemp+6ntn/ 8iqmage 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 negazy d5l7 *g(lertive 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 of the magnification is larger than one, then5 zwfx5/eei*k8t 2s-z mhq3 c8m (eqat the image isk/83etm 8( qfwse c *zm52et5q iaz-hx

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 smaller tha .c stfzt:mxzt :b7n*,ph)u;vn one, then the image istvbz;,):zmc*fpsx:th t7 n.u

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 thewium/r r snx h//a xb;h)-3)g l1xl(uxqi/0jf 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 fastes y4l *g.94pro t6rbs1zpzh 4tqt

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 inde c nxke1 9ex255g(y rz6era*z/cvwkb,x 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 me zk ,e9q1x ptk5zp-.8xmvg1mxdium 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 refractionpm4th5s/ (fwo+o *eml 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 incidenibq 7 :w-yf/ zw1qmd5tce

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,, (tx +uylpfxubnp2+g 5o1xc angle into a denser 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. The angle of refrvw xwr2o 1d 7)mwbp9;yaction 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 pla91 qd:kuy uzi,k/wr;mte 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 or);ia zqe4d,d*y j6fcs; +bolptics 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 water intbauo.-vd n- a)o 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 lense,y+n1w( ,n xdzzs h,6qj6y lods 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 thickz x6w4fjm ;pgy5ligp81+j s (pest 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 th-q/st/erqq *m e 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 th vmv77r+b,pdy;qz+w he 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 slff. hk3hp *1yc +j8n 3yaxukc+z39gcimilar except that lens B is rated at 20 diopters, whereas lens A is ra*nu8p39 f gk 3a+yzyxkjh 3lf hc1.cc+ted at 10 diopters. 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 the axis of a thin concave lensnb)k3u edd 1f8, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to the axis of the lfbkded)83u1 nens

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, travelin)skobv)h3hiy0- a p r pfg)2a5m(fcs;g parallel to the axis of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges t3vc hrm0 bago2y s;pif-))f( ka)phs5 raveling 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 rayj4(jng 3zj),swz a+2ywfw y2f s for finding the image position due to a thin lens gn+j)j3w 4(,f2za fswz2ywy 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 foorw 5(;r6kgc4 ev8jghcal length $f$. 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 focal1ca 0zjt;i1ci length $f$. 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 lengg sim8m1 u3)kns ;o4odth $f$. 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 focalr 52 t:h(,w4vv kw rnp n+er9sdalpq70 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 length z rswl9 )l21gs$f$. 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 its focal point. 3pzreh3 gl(+w(g f9vl,f2fy v The image formed ipf(9ffrlyv zg g 2l3(,e3+v whs

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 km:hpi3gai)0 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 throughfs5*ijmpdy*1+tye : t 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. Between the lamp and thlt fob9( zp(,de screen is placed a converging lens of focal length 24 cm. The ,fzltpo9b d( (filament of the lamp can be 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 fsngda( f1veh; n5x q11ocal 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. Ipl565z1wg7zfa7 dca43 u hgm v6yjv ht5nr)/xf each has a focal length of 20 cm, how would you expect the co5hgvxt3y4c) zdv 6wn7r aufj65 /amp1 gl5h7zmbination 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 ($f = -4.0 \; cm$) 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 planea)p,x;5c19w79rpv bwse g yyb 's reflecting surface with an angle of incidence of 1cawp97x9pb5sw reb gy)y ;,v$52^{\circ}$. 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 imc .8 pgs3no mp(8mcv2oage formed by the mirror appears 8sg v n2pmcco.(8po3 mto 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 froai+ lid,*) ovpk+7wa(4puu 1l;vrxp 2eyh)gc nt of a vertical plane k+ix4vrua2 (iu+v y ;o7*w dppegc)1alh ,lp)mirror?

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 approach a vertical plane mirror at3d,7wiwu,vn i a speed i7nd w 3i,,wuvof 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 m10z8eplivniyi:v 4 1b *:nh qbirror has a radius of curvature of 20 cm. How far from the mirror is the f:vnbi 41ip1e nh0zy i:8 qvlb*ocal 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 imagur*p b 6vku.2 olkp-pqbd*, n3e 30 cm from the mirror. What is the object distancer k62o*u qb pnv*l3 dpk-,u.pb?

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 front of a concave mirror, and the image is 3.0 cm in f i42.fl 7yhjl *vyg4aqront of the mirror. What is the focal length of the migvhi * ay.4q7 lf42lyjrror?

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 lep )j0h3064+d q/k;isk jkm cre/v iabpngth 3 cm. Where is the ima jdk)/kq0i/v0pc 4ma ;ih6prk3eb s+jge?

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 o2olh t qi(86bso, ad(sf 20 cm. An object is placed 10 cm in front of the mirh( ti, qs l8abo62do(sror 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 lenu6q(q g0 joae2zyf4/ agth of 20 cm. An object is placed 30 cmoyqefgq 6 2u(aazj/0 4 in front of the mirror on the 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 mirrorwmdu9t*yf 0d+. The image is 4.7 cm tall, and 10 cm from the mirruyf* w0 dtd+9mor. How tall is 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 len e.k a2z*o0n*qrnx5x6 fa lgw5gth 20 cm. The object is 4.0 cm tall. How tall is the image? 2l*.6qnkzag fw5*x5xnaer o0

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 cmf/ucqx-j9)8( twhjosn8a hk;4 06 c* ajkbuzg tall. The image is 38.6 cm tall, and 14.8 cm from the mirror. How far is the object from sco4t6zj/xhkakajub 8h-;8gju *cwq (f n 90)the 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 object2c0clgjk8j*. mp s0w v is 4.0 cm from a concave mirror. If the image is 4.0 cm tall, how far is it from the j2jm l 80cgv c0*.skpwmirror?

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 cuvz. iz9nbs5d(:gg2a+n ib:g x*y 4 mconcave mirror of focal length 20 cm. The object is 4.0 cm tall. Where is the imazxda gmi. ug bvs:ig(b5nc: z+29ny*4ge 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 front of a cosmetic mikd)st zb88 z0wy 7o-xxrror (concave mirror), the erect image is twice the size of the object. What is the focal length of the dots7kb88x y0 -zxwz) 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 frong /za fy60bqr5t of a concave shaving mirror. If the image is an erect image 1.5 times as large ab fg5/zy r60qas 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 behind a concah 31irj i;s/fqve mirror with focal length 5.0 cm. Where is the obje js;if h/3irq1ct?

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. An object is place/2aff ff,48l jgz clgd,b d/l0d 10 cm in front of the mirror on the mirror' g,cfaf/ j42,/zg8 df0bdfllls 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 cm. An object z 0 i vo40ts(4be(fgcyv)j9bt is placed 30 cm in front of the mir sfb(4o)i0j9(tc04 b ytgevvz ror on the mirror'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(v- ovjou s)mw8o;ci7 cm behind the mirror. What is the focal length j(imv s7)w- 8o;ouocvof 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 m8 owjx/w71zinvex mirror. What is tw71zoj 8 xmiw/he 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 in(8b mx:vuapjov 9e+s3p1h +g mdex of refraction of 1.50, what is the speed of light through itx:j mvs +o p9gv8hb+(ump 13ea?

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 incidento6v(sk2dy1ipvv :q h q8 (h4vm 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 a esjl/1:iv 4-4r aeexqn 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 l)q6w )2/rhn 6wmapodray 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 spread smoothly and aqc*g3+a+z-m.t llos evenly over the surface of water on a windless day. What is t+qc.3lo-a saz* mtgl+ he 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 o 61dky3uhjz5xf 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 bd6uy5 x1k3z jhank 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 of transparent material at d*w+ -iwb0x/qzp zdk;4iump .an angle of ; /pww-p*zid qi k0b.ux+mz 4dincidence 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 *jilds 8 qj ihkc859h0incident on a slab of transparent material. The inciden0h*jdq kiih8ljs 8c 59t 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 passing through iif+bfr1ii 9of a6 ho ;r;:mf4ut at ia ohf4b 6 im ;;fi9frr1+u:fo$53.0^{\circ}$. 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 ano/kyyl ,46mxw, m0 zosfk9dg x if+b02gle for light traveling from crown glass (n = 1.52) into 6l9 w xyg+/ dmmffbki4o0o,ykzs20x,water (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 itshtqe sz83 5lj4 critical angle of incidejq54zt8 3hles nce?

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 refractioznu/4gksk5bus2/( ug n of 1.50. For what angle of incidencek5g nbu/uku4 s/s2(zg will light 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 substy rsof. 47elmmhk +c/*ance 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 subst eo9 3h8**czsqqwrh /gance 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. yu,.blgj75el0 meter long and has a diameter of 20 mm. Its ends are peryl elu7j. 5g,bpendicular 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 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 foc+i(4+x6yoimab j oze 16 cf,nral length converging lens. How far is the icnjyr e ,z16o+ amio6xi b(f+4mage of this object from the 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 2c3xnh*wne1tk5smf , a converging lens with focal length 4 cm. Where is the inthemxn2 , w3 15sckf*mage?

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 lenspji6t 6zjb9 y/g/-9wprlqrl/db / +eh, and the image is 4.0 mm behind the jt6g/ z- lpdb/i r l99 +b/wqepr/yj6hlens. What is the focal length of the lens?

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 converging lens. If the imc fc+,+v lblrfx 44pk9age is 4.0 mm tall, how vbkx,r4 + fp4+cfcl9l far is it from the lens?

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 fr 9t:jszam n 6ak(y)zy)ont of a converging lens the inverted image is half the size of the object. What is the focal length of this n:t( z9jysay) )6azmk 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 lens with focal length 5.0 mm. Wher ht+fcl1 t /l7wxv1g4ne is the7+ t n1vl4/xtlfcwhg1 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 ld8txo*9ek ffz0+by3f ens. The image is virt f0xe39tzb8dk f y*+foual and 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 from a converging lens. The image is 4.0 mm talgw y.g)sad9p+jb4h j5 l, and 9.0 cm from the lens. How tall is the 95hbg+4wjp.agyd ) j sobject?

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, i+un6ys4 lufv /t forms a real image. When the objeu vufsyl /n46+ct 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. $20 \; cm$

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 r (ai)*s pnwzpfv.-q.distance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm.fp() .-rqp nasv zw.i* 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 +om .u0 ls/loj3ppnm2by/g)t in front of a diverging lens with a focal length of 10 cm. What is the image dy jbt u)m2l ons/g3m+0p op.l/istance?

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 diverging l .;neuxq9ptbq94exa 1 ens with a focal length of 10 cm.eep;b 9 nq14xta xq9u. 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 diverging lens. The imclou) l7vkd :vwzegh21/;5r gage is 4.0 cm from the lens. How tzg :/1;ld 72 gr)kvowv5e chluall 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 diverging len9c fr)fph lg*z4*i pr2s. The image is 2.5 cm tall, and 7.5 cm from the lens. Whagri frl*4cfh)2 z9p*pt 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 diseiz8oy:sy3o04f h h g46im8ku2mu;ettance of 40 cm from a thin lens. If a virtual image forms at a distance of 50 cm from the lens, on the same side as the object, what is the focal length iyh2uy ;:em3huf884k6i m4s eooz0 gtof 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 the object bs c:xk;sxz81ed.-g mbe placed if it is to form a ; s:xdgb-. mk8ezx1scvirtual 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 length lens, such as is used in m.btxxv;s6w n4l;l 7emany 35-mm cameras, must an object be positioned if it is to form a real imawmex tb;xn6 ;lv47s.lge 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 focal length 20 cm, are placed in concgpvp9m- smv ;vo9t 9/tact. What is the focal length of this ccgv 9pvvots-p;9/m m9 ompound 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-wx /5i)e+ v; aa2buivfconvex) thin lens has radii of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is the focal v ;v 2ubia/ a)e+5xifwlength?

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 = 1.50) has a radius ofugx8, i9a /,br x g wny8dld7hweb3nyd;d8;g, 40 cm on the front eh 8d,9wdbg;y8 n,;ygwb738gx inux/,ldrda side and 30 cm on 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 plasticne;wz4gktof9i 7)yzsl hf, c661a z5m (n = 1.70). The radius of the front su5f4zo,9 )w etk6sm1c lz ;n i6gy7azhfrface is 20 cm and the radius of 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 itkc(y 6p/ettxh( 6bs. s to have a focal length of 40 cm. It is made of glass of index of(p6 xk(e y/tcht6bs.t refraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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