It comes down to the relative stimulation of the colour receptors in the eye. There are only three types of receptors: red, green and blue. They are not perfect and are stimulated by a range of frequencies (a bell curve).touqra said:But why do I see green? Why not some other colors like purple?
Danger hit it in the head. Pigments subtract colours; light sources add colours.touqra said:Further, we see something blue, because that object absorbs all wavelength except blue wavelength. If I were to mix blue, red and green liquid together, why don't I get a white liquid? But why blue, red and green light mixed, gives you white light?