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# Light

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Visible light is the portion of the electromagnetic spectrum between wavelengths of about 400 n m and 800 nm (in air?). The different wavelength mixtures are interpreted by our brain as colors, ranging fron red at the lower frequency to violet? at the highest.

Light travels at 3x10E8 meters per second in vacuum, or about one third of a meter in a nano-second. Since the speed of light in vacuum is a constant, one may measure distances in light seconds, minutes, or even years.

The term light can also refer generally to electromagnetic radiation, e.g. ultraviolet? light or infrared? light.

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Last edited August 13, 2001 5:01 pm (diff)
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