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Optometry > AaD > Flashcards

AaD Flashcards

(74 cards)

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1
Q

What is the formula for the vergence of light entering a medium with refractive index n?

A

V = 1/f = (n - 1) / R

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2
Q

True or False: The vergence of light entering a medium with a higher refractive index is more convergent.

A

True

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3
Q

Fill in the blank: The vergence of light entering a medium with a lower refractive index is more __________.

A

divergent

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4
Q

What is the formula for the refractive index of a medium?

A

n = c / v

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5
Q

True or False: The refractive index of a vacuum is always 1.

A

True

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6
Q

What is the relationship between the refractive index and the speed of light in a medium?

A

n = c / v

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7
Q

Fill in the blank: When light enters a medium with a higher refractive index, it bends __________ the normal.

A

towards

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8
Q

In which direction does light bend when entering a medium with a lower refractive index?

A

away from

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9
Q

What is the critical angle for total internal reflection?

A

sinθc = n2 / n1

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10
Q

True or False: Total internal reflection occurs when light travels from a medium with a higher refractive index to a medium with a lower refractive index.

A

False

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11
Q

What is the formula for the angle of refraction when light enters a medium with a different refractive index?

A

n1sinθ1 = n2sinθ2

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12
Q

Fill in the blank: The angle of refraction is __________ when light enters a medium with a higher refractive index.

A

smaller

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13
Q

True or False: Snell’s Law describes the relationship between the angle of incidence and the angle of refraction.

A

True

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14
Q

What is the formula for the magnification of an image formed by a lens?

A

M = -di / do = hi / ho

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15
Q

Fill in the blank: A magnification greater than 1 indicates the image is __________.

A

enlarged

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16
Q

What is the formula for the focal length of a lens?

A

1/f = (n2 - n1) * (1 / R1 - 1 / R2)

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17
Q

True or False: A converging lens has a positive focal length.

A

True

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18
Q

Fill in the blank: A diverging lens has a __________ focal length.

A

negative

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19
Q

What is the power of a lens with a focal length of 20 cm?

A

P = 1 / f = 1 / 0.20 = 5 D

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20
Q

True or False: The power of a lens is measured in diopters (D).

A

True

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21
Q

Fill in the blank: A lens with a higher power has a __________ focal length.

A

shorter

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22
Q

What is the formula for the lensmaker’s equation?

A

1 / f = (n - 1) * (1 / R1 - 1 / R2 + (n - 1) * d / n * R1 * R2)

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23
Q

True or False: The lensmaker’s equation relates the focal length of a lens to its refractive index and radii of curvature.

A

True

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24
Q

Fill in the blank: A lens with a higher refractive index will have a __________ focal length.

A

shorter

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25
What is the formula for the power of a lens in terms of its focal length?
P = 1 / f
26
What is the speed of light in a vacuum?
299,792,458 meters per second
27
What does the term 'wavelength' refer to in relation to light?
The distance between successive peaks of a wave
28
True or false: Light can behave as both a wave and a particle.
True
29
What is the unit of measurement for wavelength?
Meters (m)
30
What is the relationship between frequency and wavelength of light?
Inverse relationship - as wavelength increases, frequency decreases
31
What is the electromagnetic spectrum?
The range of all possible frequencies of electromagnetic radiation
32
What is the formula for calculating the speed of light?
Speed of light = frequency x wavelength
33
What is the color of light with the longest wavelength?
Red
34
What is the color of light with the shortest wavelength?
Violet
35
What phenomenon causes light to change direction when passing through different mediums?
Refraction
36
What is the angle of incidence equal to when light is reflected off a surface?
The angle of reflection
37
What is the law of reflection?
The angle of incidence is equal to the angle of reflection
38
What is the principle that explains why light bends when passing through a medium with a different refractive index?
Snell's Law
39
What is the phenomenon where light waves spread out as they pass through an opening or around an obstacle?
Diffraction
40
What property of light determines its color?
Frequency
41
What is the unit of measurement for frequency?
Hertz (Hz)
42
What is the bending of light waves around obstacles or edges called?
Diffraction
43
What is the term for the bending of light waves when they pass from one medium to another?
Refraction
44
What is the name of the process where light waves bounce off a surface?
Reflection
45
What is the term for the spreading out of light waves when they encounter an obstacle or opening?
Diffraction
46
What is the phenomenon where light waves combine to form a new wave?
Interference
47
What is the term for the bending of light waves as they pass through a narrow slit?
Diffraction
48
What is the phenomenon where light waves cancel each other out when they meet?
Destructive interference
49
What is the phenomenon where light waves reinforce each other when they meet?
Constructive interference
50
What is refraction?
The bending of light as it passes from one medium to another.
51
True or False: Refraction occurs when light travels through a vacuum.
True
52
What is the formula for calculating the refractive index of a medium?
Refractive index = speed of light in a vacuum / speed of light in the medium
53
What is the unit of refractive index?
Dimensionless
54
What is the lens power formula?
Lens power = 1 / focal length
55
What is the unit of lens power?
Diopters
56
A lens with a focal length of 0.5 meters has a lens power of ______ diopters.
2 diopters
57
What type of lens converges light rays to a focal point?
Convex lens
58
What type of lens diverges light rays?
Concave lens
59
What is the focal length of a lens with a lens power of 4 diopters?
0.25 meters
60
What is the relationship between lens power and focal length?
Inverse
61
What is the unit of focal length?
Meters
62
True or False: A lens with a higher lens power has a shorter focal length.
True
63
What is the power of a lens with a focal length of 0.2 meters?
5 diopters
64
What happens to the focal length of a lens when the lens power increases?
Focal length decreases
65
What type of lens is used to correct nearsightedness?
Concave lens
66
What type of lens is used to correct farsightedness?
Convex lens
67
What is the focal length of a lens with a lens power of -3 diopters?
0.33 meters
68
What is the relationship between lens power and the ability to focus light?
Direct
69
What is the refractive index of air?
Approximately 1.0003
70
What is the refractive index of water?
Approximately 1.333
71
What is the refractive index of glass?
Varies depending on the type of glass, but typically around 1.5
72
What is the relationship between refractive index and the speed of light?
Inverse
73
What is the angle of refraction when light enters a medium with a higher refractive index?
Less than the angle of incidence
74
What is the angle of refraction when light enters a medium with a lower refractive index?
Greater than the angle of incidence

Optometry (4 decks)

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