Question:

Light-sensitive substances are used in photographic films. Why is it that to prevent over-exposure, red light is used instead of other colors of light?

Answer:

The sensitive elements in the film are crystals of, most often, silver halide which can change their structure when excited by light (photons). ... When a photon of light strikes a grain it dissipates its energy in the crystal (grain). This energy may or may not be enough to flip the crystal into a latent state.

Explanation:

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