Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors and lenses has be3uaesuv7 .)zo en successful described b7ouvae u.s)3zy 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 incidenceej ;6)o1ft;h -c sxtz/v4 more

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 mirrori0yksb l-y2g/s 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 2kt 2enxzmxu8.64sipan image that is

A. real and upright.

B. virtual and upright.

C. real and upside down.

D. virtual and upside down.

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Plane mirrors produce images w/ 8 x0nnega i 5cdf:zfagt94k.hich

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 actuallybmq17 zemhi 7z,4er *r pass through the image location, and would not appear on paper or,ri 4 q7zmzmhb*7e e1r 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 thek 1enx iqu7d:m.s02c g light rays pass through the image location, and could appear on paper or film placed at the :ku7i1c.0nqg2ed sm xthat 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 lf:et( 3glc*i virtual image?

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

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

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

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

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

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on which reflect6wie 4b7++nkumgz:w rion takes place on the outer surface of the s4gu:r z+w 7mei +bn6kwpherical shape is referred to as a

A. convex mirror.

B. concave mirror.

C. plane mirror.

D. double-sided mirror.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical mirror on9z3lo(93 w3 ngxbloge which reflection takes place on the inner surface of the sphere is referred to as a x9n(3 z eogl93w3glbo

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 leng).jip/iel -u r1a y2rfth 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 tzoe/dx0mhd t6e9cw1 9u mw0w2 o a concave mirror's axis, strikes the mirror's surface near its midpoint1 0c0 mwzwe 99/6dhwe xdt2muo. 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 par;7 xo odlplyv/o 48d0th parallel 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 am,h g c m-kpw.m(x)za1 concave mirror's axis, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflectio c(g1 .kzx-m,m )hmpawn, 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 throug q8kqxkz/ qq9f)vi )e6h the center of curvature is reflectqqv6k) )i8qefz9x q/k ed

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

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

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's surfa pg.. 7tcgkyljxzg**sz-7 z*ace, crosses the axis at the mirror'sjs z* z.*lg-yaz7xp*t7k gcg. 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 mirror on a path through the focal point is w08lep6fzv9kl08 rvq; , uph- zf)f kxreflecte0) k0f8zpv8f;k l vfeupzrhx9qw-6 ,ld

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 f2fl:fb; c*lp*yih: x k0xh2 ojinding the image position due to a curved mirr * o j;fcfx0bk2*yhh::il pxl2or.

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 ,fuiec6ok 6s50 zf d)wa concave mirror, exactly at its focal point,

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

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

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

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

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

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a concave mirror's cent d) peg0nlb4+s*2q, d cul.rhfer of curvature. The image produced by the mirror is lh2d d pu,l rn f0b4eq*c+l)g.socated

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 4x c,g 24. 4ldtx.jud kmc2wyl dsbk;y i(.t2qconcave mirror's center of curvature and its focal point. The image produced by td bxs.q2t4j,c;wl.(glc 22i4 xd.u4kydy ktmhe 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 conc:g(yoghq0kn y+ 9j(e bqc6w7, fhd5h qave mirror's surface and its focal point. The image formed in thisqd f5(g c hgekby0jq,ynq6o79+ (w: hh 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 th:2lqor 2 q utu*pew.3ie same distance from it as its radius of curqe w *l3iot2q:2u .rupvature,

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 fr 2g3tgkouvy/kj( ks*b(6c; dvom it as its focalt *dug/ygkskb2; (6 c3o k(jvv 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 ac3djpntiv -) s5ovx mr2h/30a magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) tac2o)53v n p/0mvx3hidrsj-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 mi)qfsh5fsr ./:w8* asm0aat3j pa huj( rrors 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 pro swwy.8 8cim9)g)jqe.u3 9wyk,aaf wtduce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A single concave spherical mirror produces an image which i,ed o ,hu7f1a//9lbt+dw c5nh3gt rhn s

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 xg(zn xp/4)3lzqej arl5j+.aan 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 mi whci,1h j5.bdrror 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 positivdw w5s/tu yu 8mwjwlkzm81f64 v-5y1 pe, the image formed is

A. a real image.

B. a virtual image.

C. either a real or virtual image.

D. can not be determined.

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the image distance is negative, the image formed i k u16xzs2yf;dmf8lj8eg+l,g7bvmjacl2z4; s

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 imae f80ep.p;yg qkxnl3 -ge 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 0uz9ia,z xggh-bhz3 ;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 isr qd+a)--mn7xf5 bp:mgdlur 5 larger than one, then the image is5xq m-ldgpfndmrrau5 -7+)b:

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 is9ut p;1jemj thsfh)nlb 85 60g smaller than one, then the image i l pm1;jb56f s0thg )tunje98hs

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 ki:(os 4iqgtkdqt4+(kfbd;qdp-8 i/ 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 fastests,i,d o:toov,

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 materialcte5g0yg69h 9fqw 2(nc6 jnlfjs7 o0l substances, 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/l z)azz i)m54x-po kh for a medium would imply

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

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

C. refraction is not possible.

D. reflection is not possible.

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The index of refraction of diamondo4f*p ubg 8cm6 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 incidenb8a ua:;fk.cfu*byz 06uilzh;vy( f/ce

A. must equal the angle of refraction.

B. is always less than the angle of refraction.

C. is always greater than the angle of refraction.

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

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light traveling at an angle into a denser medium is refratloj rt4)v)m8d28vn+ 4x5bk) xis pawcted

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 refc1l3a9mgk r ugga487m /m*y hvraction will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident on a glass pla+jtfx( yfb6em *.l 7ofkt ye6-te at a $45^{\circ}$ angle. The angle of refraction in the glass

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics iu:nv . tzpf3*ws 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 a5n i*o:s hwe2la z/h5l beam of light passing from water into air is $48.8^{\circ}$. This means that all light rays with an angle of incidence greater than this angle will be

A. absorbed.

B. totally reflected.

C. partially reflected and partially transmitted.

D. totally transmitted.

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48#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which lenses wor9sve m9omdts6,h7n. x: ,nuhrk 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 the61ru qo10esin center called

A. converging lenses.

B. diverging lenses.

C. either converging or diverging lens.

D. can not be determined.

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50#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thinner at the centes)5p avs(-moi( kivppe 0og6-yd 9)bl r 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 thickerimnj*+vsayqn28-n mu kd 3bq:n .(0gf at the center

A. spread out light rays.

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

C. have no effect on light rays.

D. reflect light rays back.

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52#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two diverging lenses are similar except thi ayob*yh )6d6at lens B is rated at 20 diopters, whereas lens A is rated at 10 diopters. The focalyd6b*ayh )i6o 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 conca1sfd6h :tykn 8ve lens, strikes the lens near its midpoint. After traveling though the lens, this ray emerges traveling obliquely to t hst8n 1:f6ydkhe 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, stri sriphv,1 76pakes the lens near its midpoint. After traveling through the lens, this rasvh6i7r1, ap py 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 thr did/ blt0)fme/l2bn 7ee rays for finding the image position due to a thin lem/il tlbe 7n0f db)d/2ns.

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 lense*,jh j(9o.xmuc . bygth $f$. 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 foc fn(fsp yl-,)gal 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 mwt81v+wx.* kwt-val length $f$. 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 le;x*(up db4 ,ghu qfqm.ngth $f$. 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 le4x:u2zx hvri -leec 42ngth $f$. 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 fn,jgx92)c1 kvogtn znz;2 wf35qwwz 5ocal point. The image formed is2zft,gwvnckw1j 5zn z;qo 95w32x g n)

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 concav k(kvh3dg -hr2e lenses

A. are always real.

B. are always virtual.

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

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

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63#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The image of the rare stamp you see through a magnifying,aiwfz3s3d w- s*p8zp 14 po(hwiuz,z 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 isum ; rkgsfl::g7c7e1j placed a converging lens of focal length 24 cm. The filament of the lamp can be imaged on the screen. As the lens position is varied with re e:17f lgcm;7jr:kgusspect to the lamp,

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

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

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

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

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

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65#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two thin lenses, of foc-:6kvcjxkv i:al 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 comygkj qlq:.ds;w 5ce. 00ol.kntact. If each has a focal length of 2 ed;.kqcs o qll0kwg.5:0y.j m0 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 icwo7u+pafhch(2 y6 7 z: 4dzvoncidence of h 6z24co:7wv+ 7fcapyouzdh($52^{\circ}$. 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 +ba3cjl na4x(in front of a plane mirror. The image formed by the mirr3ac l j+(xnba4or 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 of a vertical sdmxfshe6d l6*e( /p:4wp57dc2 ;u qvww a*dqplane mirru5s27f(w *s:/ph xddewdw6 aq; dle4* cmqp6vor?

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 atmn czy/npjxli 26plbz h+.3 -2 a speed of 2/px n.-p2mjcbi2zhl3 lyz6+n 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. Hb ea7tr2s0f1pu,tg5d ow far from the mirror is the focal point located?t 2r upgt175d b0a,sef

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 zxt72(i ch7inof 20 cm creates a real image 30 cm from the mirror. What is cii2ntzh 7(7xthe object distance?

A. $20 \; cm$

B. $15 \; cm$

C. $7.5 \; cm$

D. $5.0 \; cm$

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74#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A object is 12 cm in front of ug+h0bjs)v.v a concave mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of 0 )g.+s bjvhuvthe 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 mirf ;gpr p 2fxsft0bt69e(r. c+dror with focal length 3 cm. Where is the imab +e2g t( 6cr.xs9tppf0rdf ;fge?

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 f :u+q gjj5;cz ygcfjod12f1 d tx(2cq(a9i uz(ocal length of 20 cm. An object is placed 10 cm in front of the mirror :yj2t(d (ajz izgq(j+c;fxco5 9qf du1g c21uon 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 lnl14csmewyacf w3u1iw 2cbov f)au 2m6p1.)6ength of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the ip2 muf41cwmo v13nbeuwy c1)al6)6.icfs 2wamage 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 imazr-d(8 hi 1f,z a6tdrwge is 4.7 cm tall, and 10 cm from the mirrd zi8r1(6tf,d -ahrwzor. 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 a7g odygvqf 6js+y6n r h +f*i67.vu3nconcave mirror of focal length 20 cm. The object is 4.0 cm tall. How tall is the ima6sq+grhy n6ifv7v.u j3afd n*+ogy6 7 ge?

A. $1.0 \; cm$

B. $2.0 \; cm$

C. $8.0 \; cm$

D. $16 \; cm$

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80#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 47.5 cm tall. The image is 38.6 cm tall, and 14 ze4hkrrm:) g4.8 cm from the mirror. Heg)hmr4:rzk 4 ow far is the 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 mirror. If the 0rmp3+ m-(pxd:ndemmimage is 4.0 cm tall, 0ne:3dm p+mpdrx( -mmhow far is it 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 concave mirror of focal length vv;ub+khkx n8x4/( i s20 cm. The object is 4v; +8/xb h(4ksxv ukni.0 cm tall. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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83#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a person stands 40 cm in front of a cosmetic mirror (concave mirror)1 *qf-y 1:nvk-)tmzgr wp2h ar, the erect image is twice the size of the object. What is the focal length of m-q2zw1yv)fhk -*gtp :arrn 1the mirror?

A. $27 \; cm$

B. $40 \; cm$

C. $80 \; cm$

D. $160 \; cm$

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84#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A person's face is 30 cm in front of a concave shaving mirror. If 4l spi 8rn2(vothe image is an erect image 1.r4o 8npl 2vis(5 times as large as the object, what is the mirror's focal length?

A. $20 \; cm$

B. $50 \; cm$

C. $70 \; cm$

D. $90 \; cm$

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85#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 cm behind a concave m .q9:c,axgdhta j5 v:dirror with focal length 5.0 cm. Where is the object.vqgd cxj:5d ta: 9ah,?

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 objec ykms axx7qt5;mz9 c1(lj;yh q73eki; *dri2yt is placed 10 cm in front of the mirror on the mmi(ch*5a z9;;1ylyqs3 xmx; 77td2yjk ekr qiirror'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 ai6wo h-y (5nup focal length of -20 cm. An object is placed 30 cm in front of the mirror on t6nopyu(h5 -wihe 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 / 3 d*ic*+ab,t)zg tug cu*zlmis 5.8 cm behind the mirror. What is the focal g3*g ,tczlz*ai) um /+*udtbclength 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.fybo3uqc:5zz 9hu e;mo(4:a v 80 cm tall, and 14.8 cm from a convex mirror. What is the mirror's focal ce9qm53:fu(vz uzh b4a:ooy;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 refractiqr:kym, g jvnk,yu +(.on of 1.50, what is the speed of light through it? ,yvgj(n q :,r.ymkk+u

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 glasss osf t p;2ab0vxlz2+7 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 a3eswzsz(z 1 (ot an angle of $32.0^{\circ}$, and continues at an angle of $23.0^{\circ}$. What is the index of refraction of the substance?

A. 0.74

B. 1.11

C. 1.28

D. 1.36

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93#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light passes from air to water. Thgjq10hacxl z/,. oga 1e incoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick ix0,ay1 ezepb2s spread smoothly and evenly over the surface of water on a windless day. What is the angle of refraction in the water for a ray of light that has an angle of incidenc 1,pyxeb2ez 0ae 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. Af ez u opch5l)*fad*tt/l(,4 u0flro)t what angle must the diver shine a beam (op54trlff ) *0clhuz,o)tua/e*dl fof light toward the surface in order for a 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 tritm3dw0+ cdv mi5rdb9i5lcuh ;6f 59o dgv)g4ansparent material at an angle of infd3 wrm 5gl4idc o c u0i5+9thb59 d6v)idvgm;cidence 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 slab of transparent matercfiim2 h7g ,66l ss-kyial. The incident beam and the refracted beam make anglil72kyg-mch6 is6 sf, es 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 infusg8fi(g a5 du vlso821 a80idex of refraction of 1.46. Light is passing through it at 5v2iu ga(uiga1s0 fo88s8lf d $53.0^{\circ}$. 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 light traveling from crown glass (n = 1.52) into*lvaapqjmyi w j+x*)c62 k65 v watex6 aajijc*p )v56mkqvyl 2 *+wr (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 critic9nxlibe69 wg+r/ lff :al angle of incidegl+b xwrf: /ln69 e9fince?

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 remjou137srff: psr60 wfraction of 1.50. For what angle of incidence will light remain within the f wor0s1f ur p:6j3s7mplastic "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 mea9:l3g2p)llph 1((dyaq w dxb72qmuxq7whls ,sured 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 substyk7 0ovf2ikpru e1+w )ance from air at $30.0^{\circ}$ to the normal. It continues through the substance at $23.0^{\circ}$ to the normal. What would be the critical angle for this substance?

A. $53.0^{\circ}$

B. $51.4^{\circ}$

C. $36.7^{\circ}$

D. $12.6^{\circ}$

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104#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An optical fiber is 1.0 meter long and has yj.03 l 6pch.fkcg*yla 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 ikygypjf 0* ..cl6h l3ct 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 lv9s;8mbmlux+ ens. How far is the image of this object from m+uls9; vbm x8the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a conve9:ga()5obt k .sdy q-q4 ohvpsrging lens with focal length 4 cm. Where is the is5q p9o q vas.-y(g:ob4t)dhkmage?

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 rhe1: su84 ddj geul1yh):kv(mm behind the lens. What is the focal len811d(:)kvyd sejreuhh 4lg u: gth 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). +leie7aiw xi4e lohz+jc(4 uf: q2g lens. If the image is 4.0 mm tall, how faq4i2)cx7.a+w(u j liof:z hil+g 4eeer 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 converging lens the iib ++e9qmv r50 xr,kkqnverted image is half the si+ 5vek+x,m q0 bqrk9irze of the object. What is the focal length of this lens?

A. $13 \; cm$

B. $20 \; cm$

C. $40 \; cm$

D. $53 \; cm$

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110#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image is 4.0 mm in front of a converging lens with focal length x()mb; 2npvll5.0 mm. Where is the o(m xvn2;) lplbbject?

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 from9xgmq /ktk 98c a converging lens. The image is virtual and 6.2 cm tall. What is the focal length of the l/9km 9xq8gtck ens?

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 fj/2g u r9smphe/f9vpt4 j8g7irom a converging lens. The image is 4.0 mm tall, and 9.0 cm from the lens. How tall is r/9g 9pju i7v /m f8egtpj4s2hthe 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 j (tnwk8e u d+0 53.gwyt)vebncm from a converging lens, it forms a real image. When thete5( v wuy)n 80jtb gw.ked+3n object is moved to 40 cm from the lens, the image moves 10 cm farther from the lens. What is the focal length of the lens?

A. $20 \; cm$

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 dil8 lp0 an5gl6,y zyh4sstance of 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the values, respectively, of the image distance and lalg lahy8ls 6p05n,yz4teral 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 divergin s 8jloo 1pfd;,ogp6;sg lens with a focal length of 10 cm. What is the image distancepd;o6 j;,gf8so1 o spl?

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 fro)(g dtkfcg m;:kbo4 4jnt of a diverging lens with a focal length of 10 cm.t4( k fo kgdjg4m:cb;) 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 ni7g5bwu a (5fvvi68jof a diverging lens. The image is 4.0 cm from th8bniju5v fw756vg (a ie lens. How tall is the image?

A. $13 \; cm$

B. $8.7 \; cm$

C. $5.4 \; cm$

D. $1.8 \; cm$

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118#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 6.0 cm tall, and is in fronbiw1mr7 8i x*21ywgpyt of a diverging lens. The image is 2.5 cm tall, and 77 y8xybigwrp2 mi1w1*.5 cm from the lens. What is the focal length of the lens?

A. -6.0 cm

B. -7.5 cm

C. -13 cm

D. -18 cm

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119#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at a distance of 407egfja:ar. ,0g( bnjv wc8 +tz cm from a thin lens. If a virtual image forms at a t8jnfc w+g:b0vg,ej7(z aar.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 u iovr;*6en7usx a.h9it is to form a virtual i v;xuhu9o *en s.7ai6rmage 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 many 35a:msx vb6ns58,/ ehww -mm cameras, mu :8m e5xwv6w habsns,/st an object be positioned if it is to form a real image magnified in size by a factor of three?

A. $46 \; mm$

B. $52 \; mm$

C. $58 \; mm$

D. $67 \; mm$

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122#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Two very thin lenses, each with focal length 20 cm, are placed in cgf0 szvmjr i f8rt)ii(848+ dvontact. What is the focal length of this com)i08rgr mv(ivds +ij8 zf f48tpound lens?

A. $40 \; cm$

B. $20 \; cm$

C. $15 \; cm$

D. $10 \; cm$

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123#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex (convex-convex) thin lens has radii of curvature 46 cmjr81*5mnz, n- nm*siyul dz (d, and is made of glass of index of refraction n = 1.60.sd**n1imrzm, nl-u(8 j5d yn z What is the focal length?

A. infinite

B. $38 \; cm$

C. $30 \; cm$

D. $18 \; cm$

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124#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A double convex lens made of glass ( :uave (tmw vl,34hms-n = 1.50) has a radius of 40 cm on the front side and 30 cm on the bacm4u-vv e,smlwt 3( ha:k side. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plastic (n = 1.70)sicwqzry7 t g5+t 4v6 83qwbi9. The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What is the fo8tq w4ti+ v57zbqsw9 gcry63ical length of the lens?

A. $17 \; cm$

B. $86 \; cm$

C. $-86 \; cm$

D. $-17 \; cm$

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126#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A plano-convex lens is to have a focal length of 40 cm. It c.o9w z9jk 9quis made of glass of uwc.j9 9q9zo kindex of 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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