Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors and lenses lmxcd7q 9 dzof1t451b has been sfmd1xltqd954 c ozb71uccessful described by the

A. wave model of light.

B. ray model of light.

C. particle model of light.

D. none of the given answers

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The angle of incidenl 1c,)r m)ipvytl4 d*g3ckcc:ce

A. must equal the angle of reflection.

B. is always less than the angle of reflection.

C. is always greater than the angle of reflection.

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

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which mirrors work it6h(119fzah dwcc.w.bd *sno s

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 t h:k *rugv- ff7 r6,apbdd3jc8hat 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 whicho*rrh +6+tld-5 x qks+m3p5 8cle culh

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 kx8p1 7l )6ksxu .apvtdo not actually pass through the image location)xulk ptv 6k s18a.7px, and would not appear on paper or film placed at that location is referred to as

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays pass through tighs 9p7. llu:he image location, and could appear on paper or film placed at the.p9hs 7ilgl: u 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 virtual i.8 ochz -lnh,emage?

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 whiszw) y+,5zm bsch reflection takes place on the outer surface of the sm 5by)zs ,+zwspherical 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 on which reflection takes place on the inner surfacesmr3q of;-ij+ gacd1 d9l dg-1j5lvo0 of the sphere is refeqf ; 0oav gs+jd3d 91dmicgojrl15--l rred 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 curvatuntnahwb, mk 2;/brmlm5 :md7/re 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 axis, st,ep+ggz, g7k ku rt6: pu6j3uirikes the mirror's surface near its midpoint. Aftep6ui,3 + 6u,up:gkkz rg7jtg er 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 rlmv5 6n4hkpr 3hb ,9jb )g,avhexja/1eflected

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 axis e. ywpl 8q2dsxx hx8,+at the mirror's center of curva xx wqp8, lx+ed.h2ys8ture 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 mirrorupmjdd* -:nc/0qqhh6 on a path through the center of curvature is refl-hp0*m hdcj unq: q/d6ected

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 hspk q8ytt o3 - g50gh/lx4; j0uyql2zobliquely to a concave mirror's surface, crosses the axis at the mirror's focal point before striking the mirror's surface. After rejohq0h5;02pt/ t yxgl4-gku ly s3z q8flection, 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 thr47pos2. otym gough the focal point is reflectedo 7sy2otmp.4g

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 r *1zw)our:b+*aztan lb+fwg 8ays for finding the image position due to a curved z lara*nbfobu+)wt 1+wg8z: *mirror.

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, e39f5lzp(us pchnq7 pd my c064( gnt9nxactly 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 center of curvature. The image produlhdfb eq;;o;ew)- )akn/dh) bced by the mirror ifoe;)b bwn d)h-k;h /;e)lqd as 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+mf.r 26:b xik xs 8ywu6uh5vm center of curvature and its focal point. The image produced by the mirror is located ku.5 y6xm+sw 8fbvi: u6h2rmx

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 betwe)b ew 75)nmemr nkl01aen a concave mirror's surface and its focal point. Theem7l k5nwb)r)e 1a 0mn image formed in this case is

A. real and inverted.

B. real and erect.

C. virtual and erect.

D. virtual and inverted.

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If you stand in front of a convex mirror, at the same dm/f2qoq,w (p(2zq s.g 9p nqwfs2d.gzistance from it as its radius of curvaturep z.9mg/o.swqqg2(pqqw( 2 2 sz,fdnf,

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 s5dwtcgv b86,ok 9r ,boame distance from it as its focal ler bb8vk,g w5,cdto69 ongth,

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 l p45fh*t/ojx+pr 6i /gkfkf2magnified image (a great big you) and sometimes you see a diminished image (a little you). If you look at the bottom (convex) side of a shiny spoon, what wii j5 pf/r k ft+x2/kflpg6o4h*ll 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 imagesuj*l27nsopda5lxq0w5 u:q0 d 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 *3fy6s,jsmn e lkk7u0 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 ansko .a.3 8n.h7molm jdo v15nw 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 spherjv; aycha 39) r;cwi5 h6il;zxical 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 magnifica0(,hf)y ; -tz7ve v cfwgem(ghtion 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 positiv:+k;hdwj j px4wxl09oe, 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 istn6hlgy ht ) .y38 (qe67hkx5ry(g mrs negative, 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 positiv9a*.t ol,bt 2dkx9 6q8zn fm9xpe6 cuue 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 ne,gx1j*xl . jsy yzvzfe .pu9*8gative 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 makoa tu,sbj2+b 6zi* d x.(sfk8b;xc)wgnification is larger than one, then the image isc 8bazu2f) ,xob.k kswx(sj*;i b6t+d

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 .s1kig3al yd/magnification is smaller than one, then the image is idskg 1/3ya.l

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is equal to one, then the image t3sgad+*e3+ )9 rpab;xgepmg 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 fastestt3r2jf-isck8 k i ,b(xtvgu ()

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 rezcy n4vuy73ek;yq. b5k avt z44gr6e ;fraction

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 le20( q fr+qmsxwss than one 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 oarax22ax) bm+f 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 inciden04n *j3n6buaz kpzoi(8d*jmtce

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 refracte+/ c hb(hal 81bxby (ih3*otamd

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 k+1j,.wkay6 jq (hp u9y/bwo 6zr8iap refraction will be

A. greater than the angle of incidence.

B. equal to the angle of incidence.

C. less than the angle of incidence.

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45#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A ray of light, which is traveling in air, is incident on a glass pb ci g9gf1xz)h+s-xu.late at a $45^{\circ}$ angle. The angle of refraction in the glass

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

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

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

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

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46#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The principle on which fiber optics is based iljlw-7: am0z 9nmjc/fs

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 ;q 5bmnsxc7-a9.w n0xzzngw4beam 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 worknd6ke6 my x93p+7wlqn zc.l *v is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest at the center cacdk-- 9 ie(u+kodbck :lled

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 ati,ruzs, 4+j0qa4v oma the 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 t/7qmbh5,sze r 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 similar except that lens B is rated at 20 diopters, whe/hjdnnmh97 lay/x05a 7f+oho :my* x3mhfr :preas lens A is rated at 10 diopters. The focal ljma y hnxyo:fx077fdml5 ph h+*3/r hm/:o9naength 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 o ;3y uet l90sfie:gww+f a thin concave lens, strikes the lens near its midpoint. After tsw e ;i90f:u +gwy3eltraveling though the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through 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, sloe ))gu6*9ksk0k /fqa f7tfatrikes the lens near its midpoint. After fk9s7a0u fafgl )o)tqe*6 /k ktraveling through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

B. crossing the axis at a point equal to twice the focal length.

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three rays for finding r* --aouwwul1 the image position due to a thin len-1* wlwur-auos.

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 lengyzr2 8 psbyyqbw ctm-(2/7h+lth $f$. 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 focal l45w1vs3p3 hev s1ya adength $f$. 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 .k236i ) p5gvtiksdof fm/jz 0focal 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 focal3e1lzst: nagznabggn6 lx2 + f85h;6z 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 fx,8w1.*tm/ft aci7wb75c vnqr1w2fq v hns2xocal length $f$. 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. The image fos*.sw6 oyq jjy+s 5uo1rmed isso j5.q6w o1syuj +sy*

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 by6v(x/l7n-coeq l:l sc(-tpdnz 3 tsy) concave 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 yp jpv,lg30 .dstamp you 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 izqu/z o8k6*1qa :q* az7jqp qps placed a converging lens of focal length 24 cm. The filament of the lam aa qjq q* 8*po6kp/:zq1z7zuqp 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 loz89l l9xinczu7ccw .+.2( u posi rf0engths $f_1$ 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 ck-65bk sbszw3 ontact. If each has a focal length of 20 cm, how would you expecw-65 sk sbzkb3t 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 aufw4ur5f06u6+gge us1 n h2fan angle of incidence of n s5 ggf6wu406u1hfauu2+ef r$52^{\circ}$. 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 c m29,xf0otbufront of a plane mirror. The image formed by the mirc92 xftumb, o0ror 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 pla v:5j5uksq. tzo)dd3pne mirr5jp kusdd: ) q5v.zt3oor?

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 whef9, x5m3xvoiwn you approach a vertical plane mirror at a si omx 5,f9vwx3peed of 2 m/s?

A. 1 m/s

B. 2 m/s

C. 4 m/s

D. none of the given answers

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72#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A spherical concave mirror has f/5k3jukrhh3 a radius of curvature of 20 cm. How far from the mirror is the focal pohk h rfjk33u/5int 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 r 7uu04r dxs,qgigewr;, lt0*aeal image 30 cm from the mirror. What is xe q4w,g g;ur70its,alr0 *udthe 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 a concave mirror,it,dnok nenw5)l8xlzbqyr 56v/( ,1 o and the image is 3.0 cm in front of the mirror. What is the focal length of the mi(o6lbnxz8) tvlq 5wn5 o d,1,n/yerkirror?

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)+8 15cxicxg ajdzn7 wper5vocal length 3 cm. Where is the imag7 ci5pv j )8ex 5gcrzwx17dan+e?

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 oj,we ks- r2swjsi-,7bf 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?rk,j i wssw7 e-2j-sb,

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 0p/0i gc)r,ikx sfg 4z.bf,axa focal length of 20 cm. An object is placed 30 cm in front of the mirror on the mirror's axis. Where is the image 0g,c,.)rxfikz4gasxi p b0f/located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror. The image is 4.7 cm tcja*5k73qb)mbtcbj 6all, and 10 cm from the mc*kb a7)jq5mjc6t3b b irror. 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 le)cmvxytq d5 o6 m 7 3ahd0s/nnfy29*hsngth 20 cm. The object isshc0 2/tm h*df)y3 n y9no6a7xsd vm5q 4.0 cm tall. How tall is the image?

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 o )uvkl5ug, 6 tc:pdb538.6 cm tall, and 14.8 cm from the mirror. How far is the object from the mirr) g :v5 tu,l6koduc5pbor?

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 concavniedu0as, (+: j0 .iessbrp :ce mirror. If the image is 4.0 cm tall, honjardb(:+i 0:,e. 0ec ispuss w 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 f,ok,gjn4 dyj03 g d9+bomyc4drom a concave mirror of focal length 20 cm. The object is 4.0 cm tall. Wherebdjo,jycy9dm044k +od3ng , g 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 (concav; v5j78uiu v:y uvpw9dq-kq.ce mirror), the erect image is twice the size of the object. What is the focal length of the mirror?iv :v;.pu9 c-q5k8quw dy7vuj

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 shavin50 23ful u3 o (m10crfku24e yomwqygag mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal lenf2ycrok q e5yo u2mw010gl4f3 (3amuugth?

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 mirror with focal jeoj33nw 02iilength 5.0 cm. Where is the objec30 iow2 iejj3nt?

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 p*( sxhkt*ce a+iz8h-h p1d d(cm. An object is placed 10 cm it d*eca(*i+kxhh1 d-p(p8zhs n front of the mirror on the mirror's axis. Where is the image located?

A. 20 cm behind the mirror

B. 20 cm in front of the mirror

C. 6.7 cm behind the mirror

D. 6.7 cm in front of the mirror

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87#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A convex spherical mirrorbb *kx/8ewfbx2e8 /j g has a focal length of -20 cm. An object is placed 30 cm in front of the mirror on the mirror's ax8/eebk*fg x 2b wx/b8jis. 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 aa p4ui qe,6y(l 4u.cpee d4xd5 convex mirror. The image is 5.8 cm behind the mirror. What is the focal length of the mir54u ,pcay d64qu d.ep4e ixel(ror?

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 tal+afcp+:h;qkk)ftuj 0 l. The image is 7.80 cm tall, and 14.8 cm from a convex mirror. What is the m;q fku+0t a:p hjf+)kcirror's focal length?

A. -120 cm

B. -105 cm

C. -16.9 cm

D. -13.0 cm

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90#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If a material has an index of refraction of t4 c)nao7m+ gpk.3owth;q;v v1.50, what is the speed of light through itkcwqtm v.oa43nh ; o+;t7vg p)?

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 interface at an angle p y:q1en9 dzh3of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substance from air at an a( tii 8+2hywy(,5.jxlff ar lfngle 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 tbhh2bp)yd7-riy:bpn p7 o: x )o water. The incoming ray is at an angle of $17.0^{\circ}$ to the normal. The index of refraction is 1.33. What is the angle in the water?

A. $22.9^{\circ}$

B. $22.6^{\circ}$

C. $18.3^{\circ}$

D. $12.7^{\circ}$

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94#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An oil layer that is 5.0 cm thick is spread smoothly and evenly over the u dp*33yncj1e pel0ien :.1insurface of water on a windless day. What is the angle of refraction in the water forj piede 1. cu:l*e33y1npnn0i 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 waa3lnjs mmp ei-x068t q;;q, sijw w*1hter. At what angle must the diver shine a beam of light toward the surface in order for a person on a distant bank to see it? (The index of refraction for water 8p-wsmx0 qjh nwtlm*6q;i ,ia1e3;sjis 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, strikeslcv-f phk)16vz3gy3 r a plate of transparent material at an an6 hvcv1g3r-zf p)k3l ygle 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 travqe j1s0tuw.ft03:g bz11w+z kzwtgo/ eling in air is incident on a slab of transparent material. The incident beam and the refracted beam make angles : g310ktw+/ t e0tw.z fu1wgoj1zbqzs 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.x /y.d q/j*yrj Light is passing through it at ./yxrd/j q*yj$53.0^{\circ}$. 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 o.em ux4td:7z bt.k- rcrown glass (n = 1.52) into water (n = xm-udrtk:ob4.7 zt.e 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. Whatb zt4; 4w5veox is its critical angle of incidenc5w 4 xz4ot;evbe?

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 cle 0gxz,h,b zos1cq46 ahar plastic with index of refraction of 1.50. For wozsh, h bzc14x0g, 6aqhat angle of incidence 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 substance is measurr;jlqp fn.i +,h2kz 5l cg.g7ued 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 subst5tsu2x60 nlf)kpp6e84kiqp g/o44ccq iuuf ,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 aui scr ju94+ vm7lpw+::vu4 zhyobm)8i h)i9xnd 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 emerges from the other end?8xm 97 ivuy r) uzw 9vu+ic)4osbmi+:4:jhlph

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 focalq9q2 q;ex.zrvayvi9 u eq)o81 length converging lens. How far is the image of this object from the vvqe 9eqoy;92ir 1a.u)xqzq8lens?

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 converging lens with f7g(p43 bg kngqzujo c)o3 4yszrs/*3tocal length 4 cm. Where is thegg 3rzs3()nt4* so oqyj/ 7p 43guzcbk image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a converging lens, and the image is 4.0 hm*j495/pd49sspnap f1qe .cyomp u1 mm behind theps1fa/qu 44mc *edpop9hj5ps.m 9n1y lens. 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 ,io* . /i lkwdiih*07djht sf-it;ab6is 4.0 mm from a converging lens. If the image is 4.0 mm tall, how far ift.,ios6*; i d0wi/h*7bthli a kdj-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 fv m/6dhg n09xjwq6;tconverging lens the inverted image is half the size of the object. What is the focal lengthj6 d;t/6m0w xvf 9qghn 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 f n8rdgv)dx+j g-*, s de7cwg9 l. xkx*)lldoi*ront of a converging lens with focal length 5.0 mm. Where is the objeclk 8 .gr lx*9jsigge+cdlx-d o,v)d)x*7dwn*t?

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. xam-2 qyh1am5 ec.jo9 The image is virtual and 6.2 cm t 1.mc2haaem-y9 5j oqxall. 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 lfj1-sc vau72 gg;3td 2/orwojens. The image is 4.0 mm tall, and 9.0 cm from the lensv3 /doo t-crgj7gf22; as j1uw. How tall 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 converging lens, it forms a reak/)n1yk+sf s94zosk xl image. When the object is moved to 40 cm from the lens, the image moves 1)syfz1k/+ 9 onkk 4sxs0 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. The lens haz9siouzb h ;0t f59 o30aiz tal1/(vu,pipv5hs a focal length of 10 cm. What are the values, respectively, 0z i 5 up tva vi;luf9 9(/i1zbshaotzo3,5h0pof the image distance and lateral magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in front of a diverging lens with a focal loc2c-+)twb; qbt+n s sength of 10 cm. What is the iman+qb)otbtws2 s; c+-c ge 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 lengtm/ aw)+(w rclkh of 10 cm. What is the magnificat)rwk/ aml+ (wcion?

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 tal9q-6v9evph.fc yhujg ,4pf5p l, and 4.8 cm in front of a diverging lens. The image is 4.0 cm from the lens. How tall is thjqhc4-,g p.y5 v uhf99pv6epfe 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 lens. Tc lw9ze2f6 rd5nh yxn.c- b8b8he image is 2.5 cm tall, and 7.5 cm from the lens. What is the focal length o6n92c5 r w8 cbez8x.hlbfyd-n f 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 dis0pfjk4u1y/e btance 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 a e1y4 b0fjpu/ks 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 placendtr4w*g a+ ix2ty.2 bd if it is to form a virt22 *.bwnyaxri 4+gtdtual 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 len1h*stzt *s 4enfg*li -s, 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 the41fg* s**tl-nhzt is ree?

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, ea ef2o nwjf4h/hz uacot ;+ .x88eyh;g+ch with focal length 20 cm, are placed in contact. What is the focal length of this cewu j+48+;ho g8 hzo /fnfc2h; te.yaxompound 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 radiiycr8br v jxryd)xp 6qm704upw 9(hib:4y9l7s of curvature 46 cm, and is made of glass of index of refraction n = 1.60. What is u7x9cb w 46s4 i lq:y7hv ydmbrxj9y8prp0)r(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 (n = 1.50) has a radius of 40 cm on thdjit47vm/8p1ot dct y5t q7:le front side and 30 cm on the back side. What4 t7cvmttyi d58/1j olt:q7dp 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 us5asmldef jx7f an4j 4 -c,7/ysing a piece of plastic (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. What ys4mfle,- d77af /5sxjj4acn 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 ,wuazw6m2riv,vsr; . is to have a focal length of 40 cm. It is made of glass of index vrvsza;,u6.2i r mww, 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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