Questions on colour

Q7. A white box of photographic paper has a warning written on it, in large red letters:

(a) The box of paper is taken into a photographic darkroom where the only light is from a red lamp.

(i) What colour does the white box appear?

Red

(ii) What colour does the red writing appear?

Red

2 marks

(b) The red lamp is now switched off and a green lamp is switched on.

(i) What colour does the red writing appear in green light?

Black

(ii) Explain why the writing appears to be this colour.

A red object absorbs all colours of light except for red. It only scatters red light. Therefore it will have no light to scatter as it will absorb the green light and the onjects will appear black.

2 marks

Maximum 4 marks