Is reflection always necessary for objects to be coloured? When things glow and emit light due to excitation of electrons, is it just the same as stars produce light?
In: Physics
Reflection is not needed. Detergent cannot get your clothes white. Your clothes end up yellowish-brown. So they add a chemical that glows under ultraviolet light which makes white light so that your clothes look white. That is why some of your clothes glow under a blacklight.
Our eyes cannot tell the difference between a white object reflecting light and an object glowing with white light
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