Physics Unit23: Light and Geometric Optics

1#

Reflection, refraction, and the formation of images by mirrors an pxrx od65pkc0tn.40/)9fc9e cop pwld lenses has been successful described by /p4w9c0nxp fe .x09kpo5cptrod) l6c 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 incidencefl73d 9dja*c p

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 is ur : y 5b**9sb.hkp+y2zh5p3 bbxv,s9wdtcxv

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 formszwai) ogh)f,i 0yly;8l 4z qtt)bj8vdyd+ j38 an 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 imagk w7*s;a 3lt-e hpdi8mes which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An image formed when the light rays do not actually pass through the image locsqzs): 8m)dpbpil.0 c ation, andp:bm 0.)qszci 8s )dpl 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 the v1 93hsoy*m/, 7vfvqpx dan4ximage location, and could appear on paper or film placed at the that location is referred to y3 xmv sd/na9p xhoq7f4v1,v *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 vir9yhz h(t9j wz.tual 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 reflection takes plah+z (gp)v7*ilok8e uyf*h ;xc ce on the outer surface of the spherical shape is referred+g8zp if*vcyh(*k7ou l) xhe; 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 surf 7uyhx3xa6mb7 8fy9g x)9aymdace of the sphere is refex3f6a97mm b)agy8 h7 yyxdu x9rred 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 curvatkg gt:hhc6 k an:+77vkure 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 qs*1 jz6cpnwu*29rdlt9 k xq5to a concave mirror's axis, strikes the mirror's surface near its midpoint. Afternqpz9*dw5 qlr6 k12jtcx9*u s 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 wm4nuzic3*m+ axis is reflected

A. back parallel to the axis.

B. back on itself.

C. through the focal point.

D. through the center of curvature.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling obliquely to a concave mirror's axisoa2vebru)z f ;phmo7f;:rf .hs c+;,v, crosses the axis at the mirror's center of curvature before striking the mirror's surface. After reflecticfprr+;;a u:.)ohv z2eofs,m bfv7;h 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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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 path8. bi(q8g w)kzpx *ot.voyw5k through the center of curvature is refle). x.kpvt(k iw zq 8b*8oowy5gcted

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 0n4bz i*rd y. rb9qa;msurface, crosses the axis at the mirror's focal point before striking the mirror9bbri0qn;*.dz 4myra '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 throug98png wm t,bpe,7p+ nkou8;vch the focal point is reflectednc+nu 9b8m;vp 7po,,ge pwkt8

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 finding the image position due to a curvedw thekb3 /ayfs9o:r 1)fm3h1j mi fws1jf3hbay: hm93 1/rke)otrror.

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 co/xqy 6jw/rgpi*i:k1c 9xv ff:ms5ofw, zz;-l ncave 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 con7omy x+o8zzi 9cave mirror's center of curvature. The image produced by the mirror is locatedy+7om oz8zx i9

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 betw ee l5uo03z77zel,wpz een a concave mirror's center of curvature and its focal point. The image produced ele3e plow 77 zzu0z,5by the mirror is located

A. out past the center of curvature.

B. at the center of curvature.

C. between the center of curvature and the focal point.

D. at the focal point.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is situated between a concave mirror-qg)hbo5ka f-** muj; ab egv.'s surface and its focal point. The image q*bk-;- j)a*meh . gf5voagbuformed 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 distance from it a* 0( ue1pvksmhs its radius of curvaturpshvmu(1 ek*0 e,

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 a0n 7vkmglc7s1 wmyj gdbois9l9 k- 082 convex mirror, at the same distance from it as its focal length, mo7km 0c0i8slkd2799bg-gjvnyl1ws

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 mac x2ppib0 wft 289 mj,fyi:s9l)kk f4ognified 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, w0ojx 2)tl,s9 4 ykmcf 9:bif8iwpf k2phat 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 mirror- q(qv i3g6ydjs produce images which

A. are always smaller than the actual object.

B. are always larger than the actual object.

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

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

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Convex spherical mirrors produce images which)k qu8o sncym t)54ws4

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 im.p 2,bpw.-lgu xsma w1age 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 spherici k3;mhu 7fb j/u 1gvy0dm4q4lal 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 magnificatzmv ; no0c5pf,ion 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, ti uo3 y e:r1u7d8tdpuougc7xm4*, x0vhe 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 isyzz,c +29nj;ln*5sm dsda (+f utqsr6mj:+k y

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 plm29cd ; z3o.htmjmz30.r h ze(ljd6a positive 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 image ls j0:bkxkt 0,dj 4xdfx2+am:is

A. upright.

B. inverted.

C. enlarged.

D. shrunk.

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is larger thav*i t3 hx44u9bi6e5 eb0yi h,cs7p lggn one, then the image is 4gh c,3ui0exybb*4l s tp6vgh597ei i

A. larger than the object.

B. the same size as the object.

C. smaller than the object.

D. can not be determined.

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

If the absolute value of the magnification is smaller than 61 dwzzf h:94v/m hac57)no:xc lzfuf one, then the image ilh7)n z/z:o1fwzav c4 ucfm6 9fh: d5xs

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 tn8kyx2p7lcv ,;a)veahe 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 fastestro )ea55dhk 6zph ,f-w

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 y b cq*. zfcr55, t,1pffnwbz5index 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 thaywg12q8kxm -hn 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 of d0pa d+/adxt bz7,jd 4fiamond 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 incidenmh2ow2z5/ 5fl lc: tjwce

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 a1g06dfw k9 urv f:r de+n+jpm9n angle into a denser medium is refracted

A. toward the normal.

B. away from the normal.

C. parallel to the normal.

D. equally.

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44#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters air from water. The angle of refrc7s kc,z4x. 2oh.3fukims. g daction 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, isp uq jbl 47p19gx/wz,u 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 optics is based isqi : fmke01y7at/ lap:

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 li6rqn 35rt2d3ywe9zvm: aud j:ght 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 lejut v,)vn,6 3kv9nvb qecns5 rq5a q2-nses work is

A. refraction.

B. polarization.

C. dispersion.

D. total internal reflection.

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49#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Lenses that are thickest at th elk8dx6fc. *)fdni *de 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 atbo 5 5m6mp2rrqz65x jh 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 the cent9nym8/ct2ou nsxm ,;bo6s6khq2+ef ser

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 rvo, e:m/bwnjxg) w92lated at 20 diopters, whereas lens A is rated at 1 )g:exmnwl9 o/j,wvb20 diopters. The focal length of lens B is

A. one-fourth of the focal length of lens A.

B. one-half of the focal length of lens A.

C. twice the focal length of lens A.

D. four times the focal length of lens A.

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53#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A light ray, traveling parallel to the axis of a 6+a: km p23 ptb7dncs6x-8me 5xbsj ymthin concave lens, strikes the lens near its midpoint. After traveling though+p-bmj:6 c5ep 2tdy7bsnmsma x6 x38k 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, strikes thoz4t:de /k/o ke lentkko4/d:/ ezo s near its midpoint. After traveling through the lens, this ray emerges traveling obliquely to the axis of the lens

A. such that it never crosses the axis.

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

C. passing between the lens and its focal point.

D. passing through its focal point.

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55#

问答题 ( 1.0 分) 切至整卷模式搜藏此题

State how to draw the three raysscijk :dt9h 5.-*ij(t* yk (imv+dkqa for finding the image position due to a thin lensqd(idik+*jkijht-s.5( *y 9c:v takm.

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 lengt +/yeitda6 u1hh $f$. 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)z (kd7qfz:wc5w u/k 3(gbl uyal 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 focal2tx irbh, sx2 c8k2f7o/ tsiu4 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 len5/kx c /uorkr.gth $f$. 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 len mcixu*a 5xwkb6sv j-bl 1+.7lgth $f$. 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 formed nn,ah:h: g*sb g n::bs*hhn,ais

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 cosj g*-g)htiacbr.:3ia l)ac2 ncave 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 throughwk m-tfjg) 23x2y)i2z x/+2 hwcmld x9q wge)b 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 lamb xu1 n.xhwr0o1zp n:yn72f8dp and the screen is placed a converging lens of focal leng x70o 1 y2prn1hxb:uwd8.znnfth 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 l+0teleh b:8psengths $f_1$ 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-co ehk9zfd1x9 2cnvex) lenses are placed in contact. If each has a focal length k9ce1fxd2h9z 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 incidentoaklx: j ;:6qsn/qb-ebn1.bce of -b;bxsq l.qt onb/:6anek:1j $52^{\circ}$. 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 by tm-6 h1d8 p i.zfnpdm b.;1q.ik kn:inuhe mirror appears topk n; .pbhnf 6.q1iundmzd 1:. mk8-ii 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 p cd3m 3e-:o-dk v0puuglane :cmvud0o d k-- g3e3upmirror?

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 mi7 bs2sbyg:4ngw5tk 6.wj,fbs qs3 )ay rror at a speed of 2 m/s?s6skb n. tsb: w7gsw 5qy4,g3fbj) a2y

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. Howzf,a6.t* rn;j u i:kfb far from the mirror is the focaza, i*;.6n:jff rtb ukl point located?

A. $10 \; cm$

B. $20 \; cm$

C. $30 \; cm$

D. $40 \; cm$

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73#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A concave mirror with a radius of 20 cm creates a reaop qym*d fw4wl 3kvz06y:z7tug*b 8(tl image 30 cm from the mirrot uq fz0kpg*by8z7m*34ty:dvo w6 w(lr. What is the 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, and the image is 3.0 cm-c/. +dzt-xalyp 1sc g in front of the mirror. What is the focalc1-c ./+xglzpy st-a d 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 focal length 3 c /;bczwu8e z)boyan(2m. Where is the e(2;zw czobn)a y u8/bimage?

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 mirrat(+0zzrl+ r sor has a focal length of 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. z+s( ra +tl0rzWhere 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 mir ymlnf(ayy1r d2d76/ vz)l7jyror has a focal length of 20 cm. An object is placed 30 cm in fro)7mar/d( 2dy jyll yynz16 v7fnt of the mirror on the mirror's axis. Where is the image located?

A. 12 cm behind the mirror

B. 12 cm in front of the mirror

C. 60 cm behind the mirror

D. 60 cm in front of the mirror

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78#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 5.7 cm from a concave mirror. The image is 4.7q mzr6ymci/(- cm tall, and 10 cm from the mirror. How tall is the i m-y/zr6c(qm 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 concavea5h3/r )d hflp mirror of focal length 20 cm. The object is 4.0 cm tall. How tall/ da5rp)h3h fl 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 38.6 cm tall, and 14.8 cm from :jy amsg-22w3 66bp hg5vwazythe mirror. How far j y 5b3asm6zah26ww v-y:2pggis 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. I-;pfdn/n x s;aek2+ ( eahy6vud)p em+f the image is 4.0 cm tall, how far is it from the mva+ 2-ud+(ds;fa eenxy p6m nhk/p;e)irror?

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 l: cgf0bt pbx.lbi :( w2d-4sjuength 20 cm. The object is 4.0 cm tall. Wher bt2.uwgc(bsb-j0 4:: ipdxlfe 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 cosp+sflfapy:mp) 1*ur 1metic mirror (concave mirror), the erect image is twice the size of the obje1sypflp1: f+ra * mu)pct. What 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 cm invveh-5+0 veta ms/g1a front of a concave shaving mirror. If the image is an erect image 1.5 times as large as the object, what is the mirror's focal len e-h01+avvms5 vag/et gth?

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 i,)zco imqsg or,d1x ;bt 0q5k.r4-a(rebqq, focal length 5.0 cm. Where is th4o,5m-t ;qgeib(qc.xs r1iq, ,ra r o)kzqbd0e object?

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 3oe,j. v:v4):goro0 luio ooka focal length of -20 cm. An object is placed 10 cm in front of the mirror r : i,ov) uo3.oe4 ogjlo:v0koon 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 mirror has a focal length oxl0kbz.:d0n1 hr25h ffxtbc 1f -20 cm. An object is placed 30 cm in front of the mirrorx 0lr cfbfz:dnb 1 k.05xth2h1 on the mirror's axis. Where is the image located?

A. 12 cm in front of the mirror

B. 60 cm behind the mirror

C. 60 cm in front of the mirror

D. none of the given answers

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88#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 14 cm in f;(hpbfgu7tfld+- ) lnront of a convex mirror. The image is 5.8 cm behind the mirror. Whgl-;7f (b+p nhfdtul )at is the focal length 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. v7me2h g,.vpj wwom: /The image is 7.80 cm tall, and 14.8 cm from a convex mirror. What is the mirror's,wwvh m:2ep /g7.ovjm 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 indw kgw)-)akna1 ex of refraction of 1.50, what is the speed of light through ita)gw -k1)wkna?

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 a :w l0*vhf6cjln air to glass interface at an angle of $45^{\circ}$ and is refracted at an angle of $30^{\circ}$ to the normal. What is the index of refraction of the glass?

A. 1.23

B. 1.31

C. 1.41

D. 1.74

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92#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Light enters a substancxch6 g pm8bq/*vzw 3 d1+ksl-se from air at 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. The incoming ray is at q3s8* c1zvktvan 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 spreadu/v n yrdakx5m.g1:xksl :vjcqk,;+xzd3;: l smoothly and evenly over the surface of water on a windless day. What is the angle of refraction in the water for a :u/dlxmk z3lqckxj+dv: ,: .ag; y5;kn rsxv1 ray of light that has an angle of incidence of $45^{\circ}$ as it enters the oil from the air above? (The index of refraction for oil is 1.15, and for water it is 1.33.)

A. $27^{\circ}$

B. $32^{\circ}$

C. $36^{\circ}$

D. $39^{\circ}$

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95#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A diver is 1.2 m beneath the surface of a still pond of water. At what angle un(nk*h l y cm.c,i,3imust 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 refractiiumli c( 3nh* y.,kc,non for water is 1.33.)

A. $41^{\circ}$

B. $49^{\circ}$

C. $59^{\circ}$

D. $90^{\circ}$

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96#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A beam of light, traveling in air, strikes a plate of transparent material at ;9k e h,svk:kran angle of incidenes ;vkrk9,k: hce 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 8tn.0phjvi mbydn.fz1o p4brj /st a,j70 v;-on a slab of transparent material. The incident beam and the refracted beam make angldji v7 yv4fptob, njr0-/b.h1 .za;0t8s jnpmes 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. Lighve murm82skk4zy mg0/2t y )(ht is passing through it at ekguy m)kvz4m(2rhts0 /y2m 8$53.0^{\circ}$. 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 fuvy0eur7,p s -in17noon y-5w or light traveling from crown glass (n = 1.52) into water0n-nu7oe-wy, p vsnui r 5yo17 (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 criv y;m s1z/ sadit43y(utical angle of incidence?s s u;y z3vam/y(1ti4d

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 plaj-3ffth xxn; 7stic with index of refraction of 1.50. For what angle of incidence will light remain within the plastic "guideth7j 3x xfn;-f"?

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 substanv 5mptub,w.9 ece 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 substance frobf fe)bbv .a00/5o iorm 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 a diaku1,(hnwr b8: qd q5asmeter 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 rq(k8ubq51 wa sn:,dh 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 convvg9+* cy j;afierging lens. How fa9vaj;iyc+ * fgr is the image of this object from the lens?

A. $40 \; cm$

B. $20 \; cm$

C. $13 \; cm$

D. none of the given answers

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106#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 12 cm in front of a converging lens with /nllh gw w-;3:l8qc o6o avg2pfocal length 4 cm. Where qo/lop6: ga3 h-;c vw2 8lwglnis the image?

A. 8.0 cm behind the lens

B. 6.0 cm in front of the lens

C. 6.0 cm behind the lens

D. 4.0 cm in front of the lens

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107#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15 mm in front of a converginf+2jfq++ui:1roupobil. d 0 tcj +:jag lens, and the image is 4.0 mm behind the le ji+++. jaufjurio2l:0q+f:to b1 pcdns. What is the focal length of the lens?

A. $11 \; mm$

B. $5.5 \; mm$

C. $3.8 \; mm$

D. $3.2 \; mm$

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108#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A 14-mm tall object is 4.0 mm( waeh;.1 cnsea1(si w from a converging lens. If the image is 4.0 mm tall, how far is it fr(n e1;. ewwsca(ih 1asom 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 odzt) 1n6i+(w vb- .fdijz -crthe inverted image is half the size of th icd(-)+1vrb6w- j dz.tinf oze 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 ins xa05v-e s;t cbc+.g+ qoc2wz front of a converging lens with focal length 5.0 mm. Wher;+a sz g52v0bcc.x ocw-eqs+te is the object?

A. 2.2 mm in front of the lens

B. 2.2 mm behind the lens

C. 9.0 mm behind the lens

D. 20 mm in front of the lens

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111#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 4.1 cm tall, and 10.3 cm from a bv 9yei( 6( 1v;vhhlckconverging lens. The image is virtual and 6.2 cm tall. What is the focal length of 9(ebvc1hhy ;6 (ilvkv the lens?

A. $6.8 \; cm$

B. $10 \; cm$

C. $16 \; cm$

D. $30 \; cm$

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112#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 15.2 mm from a converging lens. The image is 4.0 mm tall, ands4p avu7c7)( nxkud i: 9.0 cm from the lens. How tall is the object?dsan (uvpc7:ui7x)k 4

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 convergitha3(ks d0o8)pxj 9dzng lens, it forms a real image. When the object is moved to 40 cm from the lens, the image moves 10 cm fart)od(htp8 3a 9d xjks0zher 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 lv-7+jn/n yk 9yp4mo1kwj(m mka9dm- 30 cm from a thin convex lens. The lens has a focal length of 10 cm. What are the(-m/lnmnmjk 49ja 9 kd+pmy yk7v1w-o values, respectively, of the image distance and lateral magnification?

A. 15 cm, 2.0

B. 25 cm, 1.0

C. 60 cm, -0.50

D. 15 cm, -0.50

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115#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is placed at 30 cm in fronfpm-ch m.fg14u*jtxe* lw( 8dt of a diverging lens with a focal length of 10 cm. What is the image distance?*.4ug1wxlcmfmtd p(ef j* -8h

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 diveso7f;xtx /:t1w9 dmzq rging lens with a focal length of 10 cm. What is the magnificationm q;o1wsd xt9:fxt7/z?

A. 0.25

B. -0.25

C. 0.67

D. -0.67

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117#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An object is 10.4 cm tall, and 4.8 cm in front of a diverging lens. ;na fo*h1q5b 1x:kj tq The image is 4.0 cm from the lf5:a qnq o;h1kj*1tbxens. 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 3go13b- fjpfx tall, and is in front of a diverging lens. The image is 2.5 cm tall, and 7.5 cm from the leof-g 31bj xpf3ns. 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 40 cm from a thin lens. Ifjah6:. t hkao) a virtual image forms at a distance of 50 cm from the lens, on the same si6h: kh.a)atoj de 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 place: 6(vnb*ar btud if it is to form a virtual image magru n* 6a:btbv(nified 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, s s o,,mcd.zdtmnp5 97puch as is used in many 35-mm cameras, must an object be positioned if it is to form a real image magnified in size bym,5m9 7dp dn ,sopctz. 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 contacp4 mi0ewb0 fa*5 scdwd.3c9;sgk 6s ubt. What is the focalpb6 ;5sd *kmw0cb0s9.disew34 guf ac length 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 46 cm3p1ao 00 tkz02jmz waoyjp-8v, and is made of glass of index of refraction n = 1.60. What is the focal l0p t8w0mz3a0ya oz j1v2-kjp oength?

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 the front 30l5 dgx)+wqh g0xm:odefp1r side and 1 hgw0derpoxg l50xqm:f3+) d 30 cm on the back side. What is the focal length of the lens?

A. $11 \; cm$

B. $34 \; cm$

C. $80 \; cm$

D. $240 \; cm$

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125#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A biconvex lens is formed by using a piece of plasticx;j -a hd/gy5gl4pr f5vv 7w/f (n = 1.70). The radius of the front surface is 20 cm and the radius of the back surface is 30 cm. 7g;j/x h5a wypf/lgfv v-dr54What 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 hav2iu) e m6ei+tgt.dlby/xb (. ge a focal length of 40 cm. It is made of glass of index of ) xt .edt.mg 2big/l6(u+ei ybrefraction
1.65. What radius of curvature is required?

A. $13 \; cm$

B. $26 \; cm$

C. $32 \; cm$

D. $36 \; cm$

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