Humans are only able to distinguish three colors, red blue and green. True white is composed equally of all colors, but since we can only see three, we can’t distinguish the color red/blue/green from true white.
Other animals with more types of cone cells would easily be able to distinguish red/blue/green from other colors. There is no animal that has an infinite number of cone types, so with enough types of light you would eventually be able to fool even sharpest eyed animal with a “fake” white light.
Mixing Cyan, Yellow and Magenta lights would give white light to your eyes. As someone else said your eyes are sensitive to red, green and blue.
Cyan is Green+Blue, Yellow is Red+Green, and Magenta is Red+Blue. So that’s 2 units of red, 2 of green, and 2 of blue. So it should appear white. Obviously we assume the light sources are of equal brightness, etc since we already do that for red,green,blue lights.
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