biprism

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bi⋅prism

[bahy-priz-uh

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–noun 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.

Origin:
1880–85; bi- ¹ + prism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To biprism

biprism
noun
an optical device for obtaining interference fringes

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