# White and Coloured Light

In this worksheet, students will look at the fact that we can make coloured light and change the colour that objects look by viewing them under a different colour of light or by using filters.

Key stage:  KS 3

Curriculum topic:   Physics: Waves

Curriculum subtopic:   Light Waves

Difficulty level:

### QUESTION 1 of 10

When red, green and blue coloured lights are mixed, we see them as white light. Red, green and blue are the primary colours. All the other colours are made from these three, when two of them overlap. (see the diagram below).

The secondary colours are:

- yellow, made from red and green

- magenta (purple), made from red and blue

- cyan (light blue), made from green and blue

Coloured light can be made using filters. When white light passes through a filter, some colours are absorbed (kept in) and some transmitted (pass through). A red filter would only allow red light to be transmitted and all the other colours would be absorbed.

The colour of an object depends on the colour of light it reflects (bounces back). White objects reflect all colours. A red object reflects red light and absorbs all others, whereas black objects absorb all colours. When coloured light shines onto an object, the object's colour may appear different.

What colour light do you get when you mix red, green and blue light?

cyan

black

white

Select the primary colours from the list below.

red

magneta

cyan

blue

green

yellow

Select the secondary colours from the list below.

red

green

yellow

cyan

magenta

blue

What can you use to make coloured light?

paint

coffee filter

filters

In the box below, write the word which completes this sentence:

As white light passes through a filter, some of the colours are ____________.

Select the option from the list below which completes this sentence:

'Transmit' means to.........

keep in

bounce back

allow to pass through

Select the correct option from the list below which completes this sentence:

White objects reflect ______ colours.

all

some

no

Select the correct option from the list below which completes this sentence:

Black objects __________ all colours.

transmit

absorb

reflect

Why do new clothes sometimes appear to be a slightly different colour at home than in the shop?

It depends on whether you view them under daylight or artificial white light.

They are washed and change colour.

They make them appear different in shops on purpose.

What would happen if you view a white top under red light?

It would still appear white.

It would appear red.

It would appear magenta.

• Question 1

What colour light do you get when you mix red, green and blue light?

white
EDDIE SAYS
When mixed, red, green and blue coloured lights appear as white light.
• Question 2

Select the primary colours from the list below.

red
blue
green
EDDIE SAYS
The primary colours are red, green and blue.
• Question 3

Select the secondary colours from the list below.

yellow
cyan
magenta
EDDIE SAYS
Yellow, cyan and magenta are secondary colours - they are formed when two primary colours overlap/mix.
• Question 4

What can you use to make coloured light?

filters
EDDIE SAYS
Coloured light can be made using filters.
• Question 5

In the box below, write the word which completes this sentence:

As white light passes through a filter, some of the colours are ____________.

absorbed
EDDIE SAYS
Filters absorb certain colours.
• Question 6

Select the option from the list below which completes this sentence:

'Transmit' means to.........

allow to pass through
EDDIE SAYS
When light is transmitted it passes through a material.
• Question 7

Select the correct option from the list below which completes this sentence:

White objects reflect ______ colours.

all
EDDIE SAYS
White objects reflect all colours, so they appear to be white, as all colours mixed together are seen as white.
• Question 8

Select the correct option from the list below which completes this sentence:

Black objects __________ all colours.

absorb
EDDIE SAYS
Black objects absorb all colours, so there is no colour to be seen and they appear as black.
• Question 9

Why do new clothes sometimes appear to be a slightly different colour at home than in the shop?

It depends on whether you view them under daylight or artificial white light.
EDDIE SAYS
Artificial white light is made using a slightly different mix of colours than natural daylight. So sometimes clothes look different when you take them out of the shop.
• Question 10

What would happen if you view a white top under red light?

It would appear red.
EDDIE SAYS
Only red light hits the white top, so there is only red to be reflected.
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