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Believe it or not, the object will appear black!

Here's why.

An object is red because it absorbs all wavelengths of light except red. It reflects the red back to our eyes, so that's what color we perceive.

If you, then, have no other light source and shine purely blue light on a red object, the object will absorb the blue light and you won't get any light reflected at all. In other words, black.

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14y ago

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