Porro prism

Porro prism
/pawr"oh/, Optics.
an isosceles, right-triangular prism in which light entering one half of the hypotenuse face is reflected at the two short sides and is reversed in orientation when it leaves the other half of the hypotenuse: used in 90°-oriented pairs in binoculars to increase the length of the optical path and to erect the final image.
[named after Ignazio Porro (1801-75), Italian engineer]

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Universalium. 2010.

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  • porro prism — ˈpȯ(ˌ)rō noun Usage: usually capitalized 1st P Etymology: after Ignazio Porro died 1875 Italian engineer : an optical device that inverts and reverses right and left an image viewed through it, that consists usually of a pair of isosceles right… …   Useful english dictionary

  • Porro prism — [ pɒrəʊ] noun a prism in which the light is reflected on two 45° surfaces and returned parallel to the incoming beam, especially as used in a conventional pair of binoculars. Origin named after the 19th cent. Italian scientist Ignazio Porro …   English new terms dictionary

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