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Spectrum, array of light in the form of different colors produced when a ray of plain white light passes through a prism by a process known as dispersion. The different colors of light are created by different wavelengths, which are forms of electromagnetic radiation. The short-wave lengths (low frequency) create indigo and violet on one end of the spectrum; the long-wave lengts (high frequency) produce red, orange, and yellow on the other end of the spectrum.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Sour gum to Stereotyping