Light is electromagnetic energy. It consists of photons that emanate from a source,
travel in a waveform, and move in a linear direction until something acts on them
to alter their path of travel. The distance measured between two consecutive crests
of the waveform characterizes the wavelength of the photon. Photons that have wavelengths
from approximately 400 nm (violet) to 750 nm (red) are discriminated as colors by
the optical detectors of our eyes. Wavelengths in the region of 100 to 400 nm are
referred to as ultraviolet (UV), and those with wavelengths longer than 750 nm are
referred to as infrared (IR).
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© 2002 Elsevier Science (USA). Published by Elsevier Inc. All rights reserved.
