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fresnel biprism

 - 2 dictionary results

bi⋅prism

[bahy-priz-uhm]
–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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