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Bristol Instruments, Inc. - 872 Series High-Res 4/24 LB
Photonics Dictionary

Porro prism

A 45-90-45° reflecting prism whose surfaces form the 90° angle reflecting the light beam through a total angle of 180°. The corners of the prism are rounded to minimize breakage and simplify assembly. Two of these prisms are used in succession in a prism binocular.
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