According to the electromagnetic spectrum, humans can only see visible light. We need special devices in order to see things like infra-red and ultraviolet waves. How come humans are born and are only able to see the visible light waves?
In: Physics
Humans evolved to see light in the frequency range most commonly emitted by the sun. We call it “visible” because we see it, not the other way around. Being able to see infrared and ultraviolet would require us to evolve new photoreceptor chemicals, ones almost no other mammal has. It would take a very, very long time.
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