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Q4. The human eye detects red light, blue light and green light. A combination of red, green and blue light is seen as white. We ‘see’ other colours when different combinations of red, blue and green enter the eye. This is shown in the table.
light entering
the eye |
|
colour ‘seen’ by the eye |
no light |
|
black |
red |
|
red |
blue |
|
blue |
green |
|
green |
red + blue |
|
magenta |
blue + green |
|
cyan |
red + green |
|
yellow |
red + blue + green |
|
white |
(a) Some magenta paint is illuminated by a combination of red, green and blue light.
Explain why the paint appears magenta.
2 marks
(b) A mixture of cyan paint and yellow paint appears green in a combination of
red + blue + green light. Explain what happens to:
(i) the red light?
(ii) the blue light?
(iii) the green light?
3 marks
(c) Most colours of paint can be obtained by mixing different combinations of cyan, magenta and yellow paints.
What combination of these paints makes:
(i) blue paint?
(ii) red paint?
2 marks
Maximum 7 marks
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