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Question

In a dark room of photography, generally red light is used. The reason is

A
None of these
B
Most of the photographic films are not red light
C
The frequency for red light is low and hence the energy $$hv$$ of photons is less
D
(a) and (b) both
Solution
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Correct option is C. (a) and (b) both
Photographic paper reacts to light to produce the image taken by a camera and stored on film. Darkrooms used red lighting to allow photographers to control light carefully so that light-sensitive photographic paper would not become overexposed and ruin the pictures during the developing process.

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