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

  • Porro-Abbe prism — A Porro Abbe prism (sometimes called a Abbe Porro prism), named for Ignazio Porro and Ernst Abbe, is a type of reflection prism used in some optical instruments to alter the orientation of an image. It is a variant of the more common double Porro …   Wikipedia

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  • prism — /priz euhm/, n. 1. Optics. a transparent solid body, often having triangular bases, used for dispersing light into a spectrum or for reflecting rays of light. 2. Geom. a solid having bases or ends that are parallel, congruent polygons and sides… …   Universalium

  • prism binocular — noun : a binocular with shortened telescopic tubes in each of which light rays entering through the objective lens are reflected by two Porro prisms before passing through the eyepiece where finally an erect virtual image is formed often used in… …   Useful english dictionary

  • Schmidt-Pechan prism — A Schmidt Pechan prism is a type of optical prism used to rotate an image by 180°. They are commonly used in binoculars as an image erecting system . Compared to binoculars using a Porro prism or Abbe Koenig a binoculars using a Schmidt Pechan… …   Wikipedia

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