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Optics II > Spherical Mirrors > Flashcards

Spherical Mirrors Flashcards

1
Q

a plane reflecting surface changes the

A

direction of light without altering its vergence

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2
Q

if the reflecting surface is curved, it changes

A

the direction and vergence of the reflected light are changed

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3
Q

the media involved influences the

A

percentage of light reflected

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4
Q

geometry of reflected light is _____ of the media

A

independent

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5
Q

a concave mirror ____ light

A

converges

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6
Q

a concave refracting surface is one that ___ light

A

diverges

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7
Q

a convex mirror ____ light

A

diverges

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8
Q

a convex refracting surface ____ light

A

converges

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9
Q

what kind of reflecting and refracting surfaces does the cornea have

A
  • convex refracting surface (converging)

- convex reflecting surface (diverging)

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10
Q

anterior and posterior cornea and anterior lens are ____ mirrors

A

convex

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11
Q

posterior lens is a ____ mirror

A

concave

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12
Q

images formed by regular reflection- mirror or refracting surface- are known as _______ images

A

catoptric

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13
Q

the optics of a mirror is completely specified by a single parameter, the _____

A

radius of curvature, r

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14
Q

image formation depends only on this one parameter

A

radius of curvature, r

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15
Q

the law of reflection is ____ of the medium in which it occurs

A

independent

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16
Q

what is another one of the mirror’s imaging properties

A

focal length

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17
Q

a spherical mirror has a single focal point F, and it is located:

A

between the mirror and the center of curvature, C

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18
Q

how is the single focal point, F, do “double duty”

A

it it both an object point conjugate to infinity and an image point conjugate to infinity

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19
Q

for concave mirror, are f and r values positive or negative

A

positive

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20
Q

for convex mirror, are f and r values positive or negative

A

negative

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21
Q

an object distance is positive if measured in

A

the same direction as incident light

22
Q

an image distance is positive if measured in the

A

same direction as reflected light

23
Q

relationship of r and f

A

f = r/2

24
Q

lateral magnification, m =

A

m= x’/x

25
Q

concave mirror with a real object located to the left of the center of curvature (C), the image is

A

real, inverted, and reduced

26
Q

concave mirror with a real object located between C and the focal point F, the image is

A

real, inverted, and enlarged

27
Q

concave mirror with a real object between F and the mirror, the image is

A

virtual, upright, and enlarged

28
Q

mirror with a real object at C, the image is

A

virtual, upright, and enlarged

29
Q

concave mirror with a virtual object (right, behind mirror), the image is

A

real, upright, and reduced

30
Q

convex mirror with a real object, image is

A

virtual, upright, and reduced

31
Q

convex mirror with a virtual object between the mirror and F, image is

A

real, upright, and enlarged

32
Q

convex mirror with a virtual object between F and C, the image is

A

virtual, inverted, and enlarged

33
Q

convex mirror with a virtual object to the right of C, the image is

A

virtual, inverted, and reduced

34
Q

real life application of case “a concave mirror with a real object outside of C, forming a real, inverted image” is

A

reflecting telescope, astronomical telescopes

35
Q

real life application of case “a concave mirror with a real object placed between D and the mirror, forming a virtual, upright, and enlarged image” is

A

very common, magnifying or cosmetic mirror

36
Q

real life application of case “a convex mirror with a real object forming a virtual, upright, and reduced image” is

A

side-view mirrors, (mirrors used to expand the field of view)

37
Q

does the index affect the power of the mirror?

A

yes, the power of a mirror does depend on index

38
Q

mirror power, P is also known as _____ power

A

catoptric

39
Q

concave mirror with a converging power has a __ power

A

+ plus

40
Q

convex mirror with a diverging power has a ___ power

A
  • minus
41
Q

does n matter for focal power and/or for focal length

A
  • focal power of a mirror depends on n

- focal length of a mirror is independent of n

42
Q

the lens-mirror power is defined as

A

the sum of two times the front surface power and the mirror power in the medium of index n’

43
Q

P(n’) power of the mirror in the medium of index n’ =

A

n’/f or 2n’/r

44
Q

D1 (the power of the front surface of the lens) =

A

(n’-1)/r

45
Q

equation for lens-mirror power sum=

A

2D1 + P(n’)

46
Q

focal length of equivalent mirror (lens-mirror) =

A

1/D(LM)

47
Q

describe spherical abberations

A

rays falling on the periphery of a mirror (or lens) will, after reflection, cross the optical axis at positions different from rats falling on the central part of the mirror

48
Q

how can you remove the problem of spherical aberrations

A

by making the mirror surface slightly different from spherical (so, aspherical)
-or parabolic surface

49
Q

what does a keratometer measure?

A

the refractive power of the cornea can be estimated

50
Q

what is the keratometer actually measuring?

A

it measures the size o the image of a distant real object formed by a convo mirror (cornea)

51
Q

by what comparisons can the keratometer estimate the power of the cornea?

A

since the radius of curvature is proportional to the image size, the power of the cornea may be estimated, based upon the value chose for the refractive index of the cornea

Optics II (7 decks)

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