Spectrum

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.