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A device used to isolate a monochromatic beam of light. A broad spectrum of white light enters a monochromator then is dispersed or spread out by a prism or diffraction grating. An exit slit is then used to select a narrow band of wavelengths such that the exiting radiation is nearly monochromatic. Monochromators are used in dispersive-type spectrometers.

Synonyms and Related Terms

Monochromator (Deut.); monochromateur (Fr.);