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I don't know exactly what is meant by color when used as in the original
question but I want my students to understand that there is no particular
wavelength of electromagnetic radiation that is perceived as white
and therefore
no wavelength we would call white light. I want them to understand that white
is something that your brain makes up when it overloads on visible wavelengths
coming from a common source. The eye sends a message that says there is some
blue light coming from over there along with some green. Some red is mixed in
too. Perhaps some purple or even a bit of yellow. Now your brain having
received all of these varying messages from the optic nerve says something
like... Blue, green, red, yellow...what should I do with all of this???? I
think I'll make something up. How about white. The only place in
the universe
that white exists is in your brain.