Do we see bands of color in a rainbow because of the physiology of eyes or the way the brain interprets the frequencies? or are those bands of separate colors a product of unequal refraction?
In: Physics
Quick answer – Yes to both.
**The biology** has to do with the way our eyes and brain and everything in between processes all the inputs and data. This can be light hitting the rod & cone cells. Then they give electrical or chemical signals through the optic nerve to the connected sections of the brain.
**The Physics** has to do with electromagnetic radiation (across the whole [Electromagnetic spectrum](https://en.wikipedia.org/wiki/Electromagnetic_spectrum) even though our eyes can only pick up a narrow range of that EM.
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