Littrow grating spectrograph

Littrow grating spectrograph

[′li‚trō ¦grād·iŋ ′spek·trə‚graf]
(spectroscopy)
A spectrograph having a plane grating at an angle to the axis of the instrument, and a lens in front of the grating which both collimates and focuses the light.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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