optical cube
Biprism Bi"prism, n. [Pref. bi- + prism.] 1. A prism whose refracting angle is very nearly 180 degrees. [Webster 1913 Suppl.]

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. [Webster 1913 Suppl.]


The Collaborative International Dictionary of English. 2000.

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