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flabberghaster OP wrote

There is no single frequency of light that will stimulate the different types of cones in the correct levels for you to perceive magenta, that only occurs if there is a mix of frequencies hitting your eyes that stimulate the blue and red cones a lot without stimulating the green cones, and as the green cone range lies somewhere in between the red and blue cone range that can't happen with a single frequency.

That I know. It's more a question of why we can't create light at arbitrary wavelengths, not why we can't create any given color using only a single wavelength.

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