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Meaning of diffraction grating

diffrac'tion grat"ing

Pronunciation: [key]
— Physics. Physics.
  1. a band of equidistant, parallel lines, usually more than 5000 per inch (2000 per centimeter), ruled on a glass or polished metal surface for diffracting light to produce optical spectra. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.