BIPRISM

biprism

(noun) an optical device for obtaining interference fringes

Source: WordNet® 3.1

Etymology

Noun

biprism (plural biprisms)

(mathematics) A fusion of two triangular prisms

(physics) An optical device of this construction used to generate interference fringes

Source: Wiktionary

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

1.

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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