In a dark room of photography,generally red l | vedclass

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(C) Photographic films and papers are coated with silver halides,which are highly sensitive to blue and ultraviolet light but have very low sensitivit

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$(a)$ and $(b)$ both

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(C) Photographic films and papers are coated with silver halides,which are highly sensitive to blue and ultraviolet light but have very low sensitivity to red light. Since the energy of a photon is given by $E = hv$,where $h$ is Planck's constant and $v$ is the frequency,red light has a lower frequency compared to blue or white light. Consequently,the energy of red light photons is insufficient to trigger the chemical reaction in the light-sensitive emulsion of the film. Therefore,using red light allows photographers to work in the darkroom without exposing or ruining the photographic material.

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

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