Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the f8af*l7ghl //kj )kfwk6 l1dllormation of images by mirrors and lenses has been successful described bylka)lf j67ldh 8/*1 /wkgkfll 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 incidencev/d56 )-cvgtae *rah:od got4

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 mirrors workx ;kq /tpqi(k r.4dis:.hhow 5 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 ifl5 zeu8p 8pw;s

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 wwh8l-wj 5 2pldhich

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 passj/q mgul/ i,h z;tb:p. through the image location, and would not appear on paper or film placed at that location is,ubzi/gq h:l p/;tj.m 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 through the image locatibi(hsr:ak f)5ukiyhn ;.s.6g on, and could appear on paper or film placed at thehg)br a:5fu;k. ishk y(n6s .i 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 virtujgh9b7a c; egf,* ywwpb+(( iial 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 refzl rq3uy3 5har5 zoh16lection takes place on the outer surface of the spherical shape is referred to ar aqh3z3r5uh 16lozy5s a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflection takes place on the inner surfas-b7r6p/oond/ tncp1 ce of the spher1p-bn6sc op do//nrt7 e is referred 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 lr6so, sg1,xlub tju/ux *g z0,ength 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 paraf6-dt/j553glmu t c dsllel to a concave mirror's axis, strikes the mirror's surface near itsl ft-/d ucgj3t5md56s 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 parallel to the axis is refl(d6xby4n v3ps(tvw7mo l tc,b)g3y 6jected

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 axis, crosses the axknd b)b; / w gi+b(zc3+(sldsois at the mirror's center of curvature befid+ ngd3kc(w b/; (b)bsl+oszore 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 c+ lu)iyypdv8 7oncave mirror on a path through the center of curvature is refi +8yu)l7d ypvlected

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 ob2q5jar-m6i3bq hb -j iliquely to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After reflectiqqaiim2b65jjh-r 3b-on, 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 mwnqq/ m()ic+yeu7h b;* s et*r:zk;bsyqxx80irror on a path through the focal point is reflectedb7*:+ st0z hkiqy/; (sw c bn8yuxm)*qre;xq e

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 th 9utdszu-a ec-.e9r9t e three rays for finding the image position due to a curved miasz9- -t ecd9rut .9eurror.

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 l rtoqfl.9/ xyl5 jov3,1v j0mfocal 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. The2v9, i tmiy-q6kwhjvfx 5z)50ox * xqm image produced by the i vf6qwoh5j x*9)y5xtv0q mmix-2 k ,zmirror 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 mirrorx:bm,doui4/ 9vg )t j2fcd s1e's center of curvature and its focal point. The image produced by t,2f):cgb9s/tvdod4iumjx1 e he 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 its focal ,:mkngh 5j,bcg6xgu 87 in,flpoint. The image formed in this 6:,jcu8 i, b,mnghf gk7x5lng case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same distance f6h o4(xj*rwp/a9cut from it as its radius of curvatuawtuo*6 9f/ 4j(hprxcre,

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 distance from it asu +8 zbjin+0jg its focalgj+8 zj0 bu+in length,

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 magnifie*j5dv /gi rn hbj(i1how5qb i8f;f: ;gd image (a great big you) and sometimes you see a diminished image (a little you). If you look at the ndfvf 5b h5 g:q1rwg8j(i *h;/iib oj;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 pro4 0vqe8s7 umhaduce 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 images whik/gx/ j a;q7gb 6z5lxich

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 ima 1ge/rjzc;1 jo. dr4rage 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 an iu;3g. mv0q7,7ec9iyyeav g d (v1jsrx mage 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 magnificati8ok q 2(t bn1o(td(hozon 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, thesgx* f5wm-sa7 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 nega;8b:i4 gw 7 wccglo-mutive, 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 positibv ss 4p;.bfy lc/l2mn8d 2f4fve value, the 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, the ixco 9olsv, 3ucy s+9 c7hde99hz2iyyx: w7wj.mage 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 9f v4 ;adye-pcev//-zjuvi7o magnification is larger than one, then the image iscfiv7y/ozpv u 9 e4jvd;--/ae

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 magnift; iizf 106 2xkovbr4o/ jcp4rc(jn2xication is smaller than one, then the image isk( ni co4fr1viz6p xt ojx/2c0rb;j2 4

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 thed3 de,sxgmr.vc ac178 magnification is equal to one, then the image is

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light travels fastestm7yn2b fo3wx d0alb;0

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 of ri6x(f. /y rgax;9dnslefraction

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 mea juc0y7,t.3b qxjhm7zf9r 3j dium would imply

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

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

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction of diamond tobvcqk(( f7. snt+4nis $2.42$. 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 inciden1 y0mw,jrocx. n9l6 ezce

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 medij*udx f0i/pn:+ lf c8qq7f.b6ulmhi2um 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 o1x1ggws8 (t1ej twi .qf 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, i:bbxahw )6thhl, qh: 1s incident on a glass plate 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 op6g wxb5 mlgavpm9)a: ah702 hztics 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 p d9q787 otvrfgrfnx(w50g;n,-xch y into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lenses work isdfwpc 5by.i. 3

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 center nbr9o:w1eg *r tqax0ldm(6/v/ cim w0called

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 t)fgxn42 r10rjujch1w ;9rixzhan 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 the centera rcmpkenu*w 7..p7f;

A. spread out light rays.

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

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except that lens B is rated at 20 diopters, wa ,ionp9 + f*;nobwd,ybor:h.hereas lens A is rated at 10 diopters. di.*+9booo h,nbnway ,;pfr: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, travelingq1a k2mw.oquxm .+2ia parallel to the axis of a thin concave lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to thm1.o2m u qk2awq .ix+ae 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 axiszhg+hl6(un(z x8- z ; )ol)qilpmz r*j of a convex thin lens, strikes the lens near its midpoint. After traveling through the lens, this ray emerges travel-lo q* ) lz8uzzjm(z6hgnxh+i l)p;r( ing 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 ra1in/ewjp8t 4q ore2 a,vj *(qhys for finding the image position due to a thin lenseoqn,h*v rj twi4q (ae/1jp28.

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 les8kjeu(uj on1 *m+3ngngth $f$. 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 focaaq. xm+8 j-g8 fbuil9ul 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 lenblc- :qrwq,7 lgth $f$. An object is placed at $f$ on the axis. The image formed is located

A. at $2f$.

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

C. at $f$.

D. between the lens and $f$.

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59#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex lens has a focal length y qm wdm nt.6q*i)2ko14vr*rr$f$. 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.np/ u4 ae7ufk $f$. 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 len f(qn*0yxh8odnnv9jq49 4vqd s and its focal point. The image formed 0fvxyd 8j4 (h 9qonqn9*4vdnqis

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 lz7dxkx49 g+a menses

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 youv0i.eu )oc5z os k8it) 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. Between the lamp and the screen is placeo m - ,e ivky8jzq+oww)pf/i*+8+sabcd a convergim8*+z jeiw,byi o8va/s +fk-pq +c)w ong lens of focal length 24 cm. The 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 focal lengthk43h53hur if os $f_1$ 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- )wko3fwo3q8 wsz*8jg convex) lenses are placed in contact. If each has a focal length gfwsk*w38 )wj qoo38z of 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 ($f = -4.0 \; cm$) 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 plane's reflecting surface with an angle of incidence oxu)ue/ucv 2j 1f /v2 )cu1u uxej$52^{\circ}$. 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 formed m bc /56:g.yxzl0 mui6r-u7w2w,ftn mn l:dcqby the mi.ln6w,:r g t mli7u-62mwcn:uy f qz5 0dbmcx/rror 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 front :oez( lz2ibf0-m : jdkof a vertical plalk:o( jdif2-z:e 0b zmne 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 plh ;:b;wh pd;olane mirror at a speed of 2 m;;ph dh l;:wbo/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 cury1yw4aee it6r pg+. y,vature of 20 cm. How far from the mirror is the foy y ryg+p,.i1wet a6e4cal 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 ahvz nskb17j(jz0p( 5m radius of 20 cm creates a real image 30 cm from the mirror. What is the v5h71b0jszj ((nm zk pobject distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of a concave mirror, and tb-o yb4e+qolnbc-) 5whe image is 3.0 cm in front of the mibc5bbq )oo4n- ewyl-+ rror. What is the focal length of the mirror?

A. $15 \; cm$

B. $4.0 \; cm$

C. $2.4 \; cm$

D. $1.3 \; cm$

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75#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10 cm in front of a concave mirror with f*-7-n) pj aj8eojupy uocal length 3 cm. Where is the im*-jpjpj7uyo ea8- un)age?

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 foypc1ce 8s8) sc6i7c ahcal length of 20 cm. An object is placed 10 cm in feci6p cshs 818)cyac7ront 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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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 placed 30 spx6ffa ed ac,.j8y -*mtr 6 i:5-onkbcm in front of the mirror on the mirror's axis. Where is the image l5trajyx., ioc 86a6n emk- dbsfp: f-*ocated?

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 con/iubfpi5t+w8f 7xus14zpir-hx7x kxkx- /d-cave mirror. The image is 4.7 cm tall, and 10 cm fixs/xpx 7 tdiu x7 b /-kzk54xi -f-pwrf+8u1hrom the mirror. 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 mirrocwrj4k n l(v(0b.2 n(u5 r/,jrze pljkr of focal length 20 cm. The object is 4.0 cm tall. How tall is the ijj k jbe.ucrw k(402v(nz/r5n (l,rl pmage?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The imq-1d mn1 njzg3nv(o9r age is 38.6 cm tall, and 14.8 cm from the mirror. How far is (z1r 1nogvn9mq 3jn- dthe object from 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 object is 4.0 cm from a concave mirri:,- wdq md)i84i 5fpf)pylndor. If the image is 4.0 cm tall, how far is ) ddl yi:m)5 -n8,pwfiqifd p4it from the mirror?

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 com0 e4mg:o0jg zncave mirror of focal length 20 cm. The object is 4.0 cm tall. Where is the img om0ezm g04:jage 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 cosmedk :lw *o0)+ nrwj+mux5x v2,xde-rvztic mirror (concave mirror), the erect image is twice the size of the object. Whatw x em)0,jvzxdxn+ :lrk 2ru+*w5vod - is the focal length of the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 ct lg7hbz bp/n )r z7p5 ao+tkk3vk:a7*,eo-ocm in front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the v5telrpotab+n-7, c bag3 :khz7op7/k*o )zkobject, 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 abjf bcokbq70-fm9-c* concave mirror with focal length 5.0 cm. Where is the objjo*-k fc 7 cbb-9mfq0bect?

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 ptob *zq)*lb+b r.m bb(ux,f y,laced 10 cm in front of the mirror on the mirror's axis. Where is )+m tzbb(f,o.,ru* qb yxl*b bthe 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 (kmak7lsqru3q 4d6 c, is placed 30 cm in front of the mirror on the mirror's axis. Where ir76 4k,3cs mla k(qudqs 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 thq ;u 1 2syv,wq::ngylfe mirror. What is the focal ley2l:s wgfquv:;1,yq n ngth 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 tc.:l1ipz jq4 lall. The image is 7.80 cm tall, and 14.8 cm from a convex mirror. Whatpq4z1ll :ci.j 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 reigv y92. q6/5fyl vrbv6tff ut77 ln)gfraction of 1.50, what is the speed of light thro6 /tv7fb)n6 v9itfrg lg5yful.2 v y7qugh 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 intee5oagf1i * *w8aoqkh:rface 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:0 bc(-vq8ag8o viiku glyg6:n angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. The incoming ray is at an angsil by2 fr5-ma(s32;az 9e;f -vuunfrle 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 evef- 5.o,z* 4i drvtysljnly over the surface of water on a windless day. What is the angle of refra*sdfi4 vt-zj.lro, y5 ction 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 ui)e(a/ nh8i3 -nsdp dwater. At what angle must the diver shine a beam of light toward the surface in order for ad8n-s /i3aehi n()up d 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 of transparent manwfq(p;: uk,xterial at an k(;q wnpfx,u: angle of incidence 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 incident on a slqq.z/oly23s pyi8 8cyab of transparent material. The pqoqcz/l8 s8y2 .3yyiincident 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. Ls t;b+fh(v m7mf4wg1qight is passing through it at hs1g(f t+v7 4mfw;bqm$53.0^{\circ}$. 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-.yq+mf0e/ja-xkdq+ /+ z okzt r;mca light traveling from crown glass (n = 1.52) into watezq.rf-y xcdzaeqo0+ k-+jmt;/am k +/r (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 crit9iculf 0hm;-o 6* ev+hu,hkjwical angle of incidecw609-mh;il +v*fkj,u uoeh h 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 plrkhrnhxv6 g443m i6 z zw4/zb:astic with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guhw6zvkhb6n4:r43 zzmrg/ 4ix ide"?

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 substancq-7: xulk tm(d; pd trn910y2ikw;odwe 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 substanceifa3zs885 ls ei v q5pgy3p0f5 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 metu;q,p ysm/)a qer long and has a diameter of 20 mm. Its ends are perpendicular 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 emergqsp)q ,y/au;m es 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 cosonzfz,+;vd.6 mlaq3o;b l3p nverging lens. How far is the image of this bqd6f;lla+v3s .oz;z,m 3po nobject 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 f e(j27au hh.4lvg q f*(/fwoycront of a converging lens with focal length 4 cm. Where is the imaa f/ o(y4 gej u7.l(cqhwh2v*fge?

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 lens, and the image is 4.0 mm be0nj hu*)y0i bp bgw/t i4wd:;khind the lens. What is the foca w:di)i0hpb*t0guj y/w4n ;bkl 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 m + /6ff5t; 6mwgbgleoim from a converging lens. If the image is 4.0 mm tag66 +5gebwfoli/m ;ft ll, how 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 front of a concq 0bn b-b90c m*cc.wojb2/usverging lens the inverted image is half the size of the object. What is the fob*qc -nccob mc2.u0swb j0/ b9cal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focal llurx km;wam1: )9g.utength 5.0 mm. Where is the object?:amk;1xrw)m ut9.lgu

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 lens. The imag*4o9 wgvkl9 p0zq-b dbe is virtual and 6.2 cm tall. What is the focal length o*do0lk b9 b9-4wgp vzqf 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 l: r) lsmq vwy+eqhpivbh7ni/3y +7*,is 4.0 mm tall, and 9.0 cm from the lens. How ts)y: vq,*yiep q/7mnivblh 7+l3hw+ rall is the object?

A. $6.8 \; mm$

B. $5.4 \; mm$

C. $1.7 \; mm$

D. $0.68 \; mm$

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113#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When an object is placed 60 cm from a co:rmur(2 n pw7r-f )-7zrhsjtinverging lens, it forms a real image. When the objec rnm2(ipru-7r-w)ftrj7zs h: t 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 distance of 30 cm from a thin convex lens.ph,5 y,9 rdmvpw2q8 6qdrljm8 The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and laterqm9,r8v l,pjdh8w6py 25rqd mal 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 fhh:lh0 l wlu-1ront of a diverging lens with a focal length of 10 cm. What is the ima: lhw hl1l0h-uge distance?

A. $7.5 \; cm$

B. $-7.5 \; cm$

C. $15 \; cm$

D. $-15 \; cm$

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116#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with a focal length p4ymum3-s5qwp ; lqn+of 1ummqnw-y 5p3p4qs;+ l0 cm. 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 fror8. ge:a uy6:h2ooad:/ gxphcnt of a diverging lens. The image is 4.0 cm from the lens. How tall is th/.a:g:aod cgo8h: eyr6h2 xupe 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 o22d0; sy1wxrv ay3 wfhf a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length of the le1rfv w;xys3a22 hdyw0 ns?

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 .z +h2mv*q-v olrr*qw lens. If a virtual image forms at avmrrzo+* wvq lq2-h .* distance of 50 cm from the lens, on the same side as the object, what is the focal length of the lens?

A. $45 \; cm$

B. $75 \; cm$

C. $90 \; cm$

D. $200 \; cm$

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120#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

How far from a lens of focal length 50 mm must the object be placed if 63h5ykz qd11 7 augfyt,dnf7gtj9x7cit is to form a virtual image magnified in size by a factor of three?7und1,aq cfyfg yk j xt7h6573tzdg19

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 lengthj46ri7jm fq-tf:l 0;sg4 jqgi lens, such as is used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size by a factor of threejfg ; :40fi- m gt6qrsqjij47l?

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 80.ytuak l)xt:(vkma with focal length 20 cm, are placed in contact. What is the focal lx a8vua(tkl ).kt:0ymength of this compound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of curvature 46upds q2w 0ks/1 cm, and is made of glass of index of refraction n = 1.60. What is the focw2u p s/s0kq1dal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass (n = 1.50) / 6(4ac:pgt+ab zgpss+5iv yphas a radius of 40 cm on the front side and 30 cm on the back side. What is s+5pzp4: aysgtgabc/i6v+p( the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70). Theggxssa-n :pgm:0e8p3 -a oh ,yen e(d7 radius of the front surface is 20 cm and the radius of the back surface is 30 cm. Whasop e,n7-ahgs :-8:d3 ey0gn(eampg xt is the focal length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length of 40 cm. :3i r7 a62lsij26lhjs xa g+phIt is made of glass of index of gixj pjli76rsa+ 3hsa6h2:2l 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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