Light Flashcards

1
Q

Speed of light in a vacumm

A

300,000 km/s

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2
Q

Light…

A

carries energy as a wave, travels in straight lines. Can travel through any medium as long it lets light through

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3
Q

How are objects that emit light called

A

luminous

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4
Q

Law of reflection

A

when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection

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5
Q

Angle of incidence

A

The angle at which light hits an object

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6
Q

Angle of reflection

A

The angle at which light bounces off an object, equal to the angle of incidence

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7
Q

Normal

A

the perpendicular line to the surface light bounces off

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8
Q

Regular Reflection

A

Any surface that produces a reflected image

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9
Q

Diffuse reflection

A

A surface we can see but does not produce a reflection

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10
Q

Refraction

A

When light crosses the boundary between two mediums, light slows down or speeds up. This change of speed can result in a change of direction

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11
Q

Light slows down,

A

Enters a denser medium and bends towards normal

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12
Q

Light speeds up,

A

Enters a less dense medium and bends away from normal

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13
Q

Light hits barrier at 90º exactly…

A

Slows down but does not change direction

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14
Q

Total Internal Reflection (TIR)

A

Only happens when light is travelling from a denser to a lense dense medium, the ray must strike the boundary at an angle greater than the critical angle

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15
Q

Angle i is less than the critical angle =

A

Refraction

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16
Q

Angle i is equal to the critical angle =

A

Light along boundary

17
Q

Dispersion

A

The separation of visible light into its different colours

18
Q

Colour spectrum

A

Red, Orange, Yellow, Green, Blue, Indigo, Violet

19
Q

Colours are…

A

Different colours of light have a different frequency.
Red - Low
Violet - High

20
Q

Seeing Things

A

The layer at the back of the eye(Retina) converts light into nerve impulses

21
Q

Rods

A

Detect the amount of light, see in black and white. Works best in dark

22
Q

Cones

A

Detect the frequency of light(can see colours). Works best in bright light

23
Q

Primary colours

A

If you mix them together you will get white light.

Red, Green and Blue.

24
Q

Secondary Colours

A

Yellow, Magenta and Cyan. Produced by two primary colours

25
Red + Green -->
Yellow
26
Blue + Red -->
Magenta
27
Green +`Blue -->
Cyan
28
Filter
A colour filter works by absorbing a certain colour and transmitting the other colour
29
Colour of things
If something is yellow it will absorb all colours but yellow and reflect it. Therefore you will see it yellow(red + green)