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Etymology: L, visibilis, vision, radiare, to shine
electromagnetic radiation in the wavelengths between infrared and ultraviolet that can be perceived by most normal humans.
The radiation of the visible spectrum, which may be broken up into different wavelengths representing different colors:
Violet, 3900–4550 angstrom units (A.U.)
Blue, 4550–4920 A.U.
Green, 4920–5770 A.U.
Yellow, 5770–5970 A.U.
Orange, 5970–6220 A.U.
Red, 6220–7700 A.U.
See also: radiation