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? Physics > 12. Lights & Optics > Flashcards

12. Lights & Optics Flashcards

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1
Q

what is light made up of what and what does each of these units represent

A

photon

each photon represents an electromagnetic wave

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2
Q

how does light behave

A

like a wave and particle

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3
Q

what is particle theory

A

energy transformation of light

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4
Q

what is wave theory

A

propagation of light

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5
Q

what is polarised light waves

A

waves where vibrations occur in a single plane

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6
Q

what do lens do to light

A

refract light

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7
Q

what do mirrors do to light

A

reflect

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8
Q

what is a real image

A

light rays pass through image and can be projected onto a screen

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9
Q

what is a virtual image

A

no light passes through image and cannot be projected onto a screen

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10
Q

for a plane/flat mirror all images seen are what 3 characteristics

A

virtual
left-right reverse
erect

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11
Q

a convex surface will do what to light

A

diverge light

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12
Q

a concave surface will do what to light

A

converge

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13
Q

what is the relationship between the focal length and the radius

A

f = 1/2radius

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14
Q

with concave mirrors light is converged towards ___

A

the axis

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15
Q

if object distance is less than focal length what kind of image does a concave mirror produce

A

virtual and erect

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16
Q

if object distance is more than focal length what kind of image does a concave mirror produce

A

real and inverted image

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17
Q

if object distance is equal to the focal length what kind of image does a concave mirror produce

A

no image formed

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18
Q

if the object distance is less than the radius what size of image will a concave mirror produce

A

increased size of image

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19
Q

if the object distance is more than the radius what size of image will a concave mirror produce

A

size of image is reduced

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20
Q

if the object distance is same as the radius what size of image will a concave mirror produce

A

size of image will be the same

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21
Q

incident rays that pass through the F when extended will reflect at what kind of angle

A

an angle parallel to the axis

22
Q

the image formed by a convex mirror is always

A

virtual
erect
smaller than object

23
Q

what is the mirror and lens equation

A

1/image distance = 1/object distance = 1/focal length

24
Q

what is the magnification equation

A

M = -image/object

25
Q

if magnification is >1 the image is ___ compared to the object

A

larger

26
Q

if magnification is <1 the image is ___ compared to the object

A

smaller

27
Q

if magnification is >1positive the image is ___

A

erect

28
Q

if magnification is negative the image is ___

A

inverted

29
Q

for r and f positive values = ____

A

positive = converging
negative = diverging

30
Q

what is refraction

A

bending of light when it enters a medium that changes its speed

31
Q

refraction of light when it passes from a fast medium to a slow medium bends the light ray towards/away from the normal to the boundary between the 2 media

A

towards the normal

32
Q

the amount of bending in refraction depends on what

A

indicies of refraction of the 2 media

33
Q

how is the index of refraction determined

A

by dividing speed of light in vacuum by speed of light in medium

34
Q

a more optically dense medium will have a ___ index of refraction than a less optically dense medium

A

higher

35
Q

what is the formula for snell law

A

sin(angle of incident to normal)/sin(angle of transmitted or refracted ray) = n1/n2 = v1/v2 = wavelength 1/wavelength 2

36
Q

a smaller wavelength of incident light will cause what angle between transmitted ray and normal

A

smaller angle between transmitted ray and normal

37
Q

what is a lens

A

transparent material that refracts light ray to form an image

38
Q

what are the 2 types of lens

A

diverging/concave

converging/convex

39
Q

what does a converging lens do

A

converge light rays that are travelling parallel to its principal axis

40
Q

what does a diverging lens dp

A

diverge light rays that are travelling parallel to its principal axis

41
Q

what does a converging lens look like

A

wider across middle and thinner at ends

42
Q

what does a diverging lens look like

A

thinner across middle and thicker at ends

43
Q

what is the focal point

A

point where rays of light initially parallel converge towards after emerging from a converging lens or diverge from after emerging from a diverging lens

44
Q

diverging concave lens form images that are

A

always virtual, erect, reduced in size

45
Q

converging convex lens form images that are what if the object distance is less than focal length

A

virtual
erect

46
Q

converging convex lens form images that are what if the object distance is more than focal length

A

real and inverted

47
Q

converging convex lens form images that are what if the object distance is same as focal length

A

no image formed

48
Q

converging convex lens form images that are what size if the object distance is less than its radius

A

increased size of image

49
Q

converging convex lens form images that are what size if the object distance is more than its radius

A

size of image is reduced

50
Q

converging convex lens form images that are what size if the object distance is same as its radius

A

size of image is the same

? Physics (13 decks)

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