Questions on colour
Q1. Sunita puts on a pair of special glasses as shown below. The glasses have coloured filters in them.
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(a) Sunita looks at a lamp through the green filter. The lamp gives out white light, but appears to be green.
Explain how this is possible.
2 marks
The green filter allows green light to pass though it
and absorbs all other colours.
Sunita therefore only sees the green light from the lamp.
(b) Sunita looks at a red lamp.
(i) What colour will the lamp appear to Sunita, if she looks at it through the red filter?
Explain your answer.
1 mark
The red filter allows red light to pass though it
. Therefore the lamp appears to be red.
(ii) What colour will the lamp appear to Sunita, if she looks at it through the green filter?
Explain your answer.
2 marks
The green filter only allows green light to pass though it and it will absorb all the red light.
Sunita therefore sees no light coming from the lamp - it looks black. 
Maximum 5 marks