6.4 Colours of light [Mastery check]

Match the following

• a colour of light made by mixing red light and blue light

• primary colours

• the three colours of light from which all other colours can be made

• coloured filter

• a transparent object that lets some colours of light pass through, but not others.

• white

• a colour of light made by mixing blue light and green light

• magenta

• light produced by mixing all the primary colours

• cyan

A green filter absorbs all colours of light except ​ (a)   .

• green
• red
• blue

A green filter transmits only ​ (a)   light.

• green
• red
• blue

All the colours except ​ (a)   are subtracted as light passes through a green filter.

• green
• red
• blue

When green light shines on a red filter, ​ (a)   light will pass through.

• no
• red
• green

A yellow book looks yellow because it ​ (a)   yellow light.

• reflects
• absorbs

A red book looks ​ (a)   when we shine blue light onto it.

• black
• blue
• red

When white shines on these filters, ​ (a)   will emerge.

• no light
• white
• blue
• red

State the colour that would be seen if red, green and blue lights of the same brightness all the white wall.

• white

• black

• yellow

• cyan

A theatre uses coloured lights to make objects appear different. Match the colour that each of these object will appear.

• A green door in green light.

• blue

• A blue ball in green light

• black

• A white T-shirt in blue light.

• green

• A red book in white light.

• red