What is the relationship between color and light?

Relationship between color and light

Different wavelengths, and thus different frequencies, of light are perceived by the human eye as colors. The visible light spectrum ranges from 400nm to 700nm, with 400nm being perceived as violet and 700nm being perceived as red light. The energy of the light dictates its color. An easy way to remember the order of the colors of the visible light spectrum is "ROY G. BIV", or Red Orange Yellow Green Blue Indigo Violet. When one sees an object as a certain color (green leaves on a tree, perhaps), this is due to the light wavelengths that are and are not being absorbed. In the case of green leaves, the chloroplasts absorb most of the wavelengths of the visible spectrum except green. Thus, green light is reflected off of the leaf and the rods in ones eyes perceive the wavelength as green.

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