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biprism

[bahy-priz-uh m]
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noun Optics.
  1. 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.
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Origin of biprism

First recorded in 1880–85; bi-1 + prism
Also called Fresnel biprism.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for biprism

Historical Examples

  • In lieu of the biprism, reflectors may be invoked to double the original source of light.

    Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6

    Various


British Dictionary definitions for biprism

biprism

noun
  1. a prism having a highly obtuse angle to facilitate beam splitting
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012