Light

Question 1

Speed of light in a vacumm

Answer 1

300,000 km/s

Question 2

Light…

Answer 2

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

Question 3

How are objects that emit light called

Answer 3

luminous

Question 4

Law of reflection

Answer 4

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

Question 5

Angle of incidence

Answer 5

The angle at which light hits an object

Question 6

Angle of reflection

Answer 6

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

Question 7

Normal

Answer 7

the perpendicular line to the surface light bounces off

Question 8

Regular Reflection

Answer 8

Any surface that produces a reflected image

Question 9

Diffuse reflection

Answer 9

A surface we can see but does not produce a reflection

Question 10

Refraction

Answer 10

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

Question 11

Light slows down,

Answer 11

Enters a denser medium and bends towards normal

Question 12

Light speeds up,

Answer 12

Enters a less dense medium and bends away from normal

Question 13

Light hits barrier at 90º exactly…

Answer 13

Slows down but does not change direction

Question 14

Total Internal Reflection (TIR)

Answer 14

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

Question 15

Angle i is less than the critical angle =

Answer 15

Refraction

Question 16

Angle i is equal to the critical angle =

Answer 16

Light along boundary

Question 17

Dispersion

Answer 17

The separation of visible light into its different colours

Question 18

Colour spectrum

Answer 18

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

Question 19

Colours are…

Answer 19

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

Question 20

Seeing Things

Answer 20

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

Question 21

Rods

Answer 21

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

Question 22

Cones

Answer 22

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

Question 23

Primary colours

Answer 23

If you mix them together you will get white light.

Red, Green and Blue.

Question 24

Secondary Colours

Answer 24

Yellow, Magenta and Cyan. Produced by two primary colours

Question 25

Red + Green –>

Answer 25

Yellow

Question 26

Blue + Red –>

Answer 26

Magenta

Question 27

Green +`Blue –>

Answer 27

Cyan

Question 28

Filter

Answer 28

A colour filter works by absorbing a certain colour and transmitting the other colour

Question 29

Colour of things

Answer 29

If something is yellow it will absorb all colours but yellow and reflect it. Therefore you will see it yellow(red + green)