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Originally Posted by fuzzybottom
with the color, i still dont really understand, im really asking if theres any difference between seeing light with a wavelength halfway between red and blue, and seeing red and blue light in the same place.
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Yes, there's a difference. If you say that some beam of light is composed of a single wavelength, that means that its electric and magnetic fields are sinusoidal. Mixing two wavelengths together means that the electric field is the sum of two sine waves. Draw two such curves on a piece of paper with different wavelengths, and then try to draw their sum (or just compute it with some trig identities). You'll see that the result is not itself a sine wave. So mixing light with two distinct different wavelengths can never produce light having any single wavelength. The result is always a mixture.