Why is red light used for night vision? Why not yellow or other colours of light?
In: Technology
By night vision do you mean infrared? If so, colour here is a representation of the amount of heat being given off by an object, and the reason red is used for ‘cold’ colours is because radiating heat is basically just light that’s *more red* than visible red light – ie, infrared – so it makes sense to the human brain to display infrared light as red light when shifting it into the visible spectrum.
if you don’t mean infrared then I suspect your premise must be wrong because non-infrared night vision is displayed with a green hue, not a red one.
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