first-order spectrum

first-order spectrum

[¦fərst ‚ȯrd·ər ′spek·trəm]
(spectroscopy)
A spectrum, produced by a diffraction grating, in which the difference in path length of light from adjacent slits is one wavelength.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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