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bi•prism



Pronunciation: (bī'priz"um), [key]
n. Optics.
a triangular prism with an apex angle slightly less than 180°: when illuminated by a point source of light it produces two overlapping beams that form an interference pattern on a screen. Also called Fresnel biprism.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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