Physics Y9 Light EoT test Flashcards

1
Q

what colours does a white object reflect/absorb

A

reflects: r g b absorbs: -

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2
Q

what colours does a black object reflect/absorb

A

reflects: - absorbs: r g b

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3
Q

what colours does a blue object reflect/absorb

A

reflects: b absorbs: r g

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4
Q

what colours does a red object reflect/absorb

A

reflects: r absorbs: g b

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5
Q

what colours does a green object reflect/absorb

A

reflects: g absorbs: r b

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6
Q

what colours does a magenta object reflect/absorb

A

reflects: r b absorbs: g

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7
Q

what colours does a yellow object reflect/absorb

A

reflects: r g absorbs: b

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8
Q

what colours does a cyan object reflect/absorb

A

reflects: b g absorbs: r

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9
Q

what is light

A

the portion of the electromagnetic spectrum which is visible

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10
Q

what portion of the electromagnetic spectrum does visible light cover

A

400-700nm

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11
Q

how are waves of energy transmitted

A

electromagnetic radiation

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12
Q

how does light travel

A

in straight lines

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13
Q

which parts of the eye refract light

A

cornea and lens

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14
Q

which part of the eye is sensitive to light

A

retina

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15
Q

which part of the eye carries electrical impulses to the brain

A

optic nerve

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16
Q

how does a mirror work

A

light reflects off of an object, then off of the mirror and into your eyes, all in straight lines

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17
Q

what is the normal

A

an imaginary line 90° to a mirror or a place of refraction

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18
Q

what is the ray that goes into the mirror called

A

incident ray

19
Q

what is the ray that comes out from the mirror called

A

reflection ray

20
Q

what is the angle in between the incident ray and the normal

A

angle of incidence

21
Q

what is the angle in between the reflection ray and the normal

A

angle of reflection

22
Q

angle of incidence (</>/=) angle of reflection

A

=

23
Q

what is the law of reflection

A

angle of incidence = angle of reflection

24
Q

is a virtual image real

A

no

25
Q

what is specular reflection

A

reflection from a smooth surface

26
Q

what is diffuse reflection

A

reflection from a rough surface

27
Q

can an image be seen in specular reflection

A

yes

28
Q

can an image be seen in diffuse reflection

A

no

29
Q

what colour is the least reflective

A

black

30
Q

what colour is the most reflective

A

white

31
Q

can light bend

A

no

32
Q

can light change direction

A

yes

33
Q

what is the angle in between the ray of refraction and the normal

A

angle of refraction

34
Q

if light travels from a more to less dense medium angle of incidence (</>/=) angle of refraction

A

<

35
Q

if light travels from a less to more dense medium angle of incidence (</>/=) angle of refraction

A

>

36
Q

why does light refract

A

it changes speed

37
Q

what happens when white light refracts through a prism

A

a spectrum is created

38
Q

what are the traditional colours of the rainbow in order

A

red (orange) yellow green blue (indigo) violet

39
Q

which colour has the longest wavelength

A

red

40
Q

which colour has the shortest wavelength

A

violet

41
Q

what is dispersion

A

the seperation of light by wavelength

42
Q

why is green green

A

because the human brain perceives it as green

43
Q

what does a colour filter do

A

absorbs certain wavelengths and transmits others