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What is "biprism"

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biprism
The Collaborative International Dictionary
Biprism

Biprism \Bi"prism\, n. [Pref. bi- + prism.]

  1. A prism whose refracting angle is very nearly 180 degrees.

  2. A combination of two short rectangular glass prisms cemented together at their diagonal faces so as to form a cube; -- called also optical cube. It is used in one form of photometer.

Wiktionary
biprism

n. 1 (context mathematics English) A fusion of two triangular prisms 2 (context physics English) An optical device of this construction used to generate interference fringes

WordNet
biprism

n. an optical device for obtaining interference fringes

Usage examples of "biprism".

I do know that the generalized Schmitt-Conway biprism will tile aperiodically in all dimensions of the form 3 times M.