What is color? What is RGB? What's additive color?

In nature, light with single colors has a constant wavelength. Different colored lights have different wavelengths.

We use RGB receptors to perceive single colors and mixed colors.

Mixed lights of different colors usually acquire a new color due to our RGB translation system.

Paints work in the way by manipulating what colors to absorb so as to give a color to the light reflected and thus perceived by human eyes. Mixing paints is actually mixing the materials that absorb different lights. So it follows a complementary law of mixing lights to alter colors


Then let's understand what is additive color
https://en.wikipedia.org/wiki/Additive_color


Finally let's tackle a more complicated problem: the colors of a rainbow
https://www.quora.com/Why-are-only-seven-colors-visible-to-the-naked-human-eye