- ['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.Originnamed after the 19th-cent. Italian scientist Ignazio Porro.
English new terms dictionary. 2014.
Look at other dictionaries:
Porro prism — In optics, a Porro prism, named for its inventor Ignazio Porro, is a type of reflection prism used in optical instruments to alter the orientation of an image.It consists of a block of glass shaped as a right geometric prism with right angled… … Wikipedia
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 — /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°… … Universalium
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
Prism (optics) — For other uses, see Prism (disambiguation). A plastic prism In optics, a prism is a transparent optical element with flat, polished surfaces that refract light. The exact angles between the surfaces depend on the application. The traditional… … Wikipedia
Porro-Prisma — Querschnitt durch ein Porro Prismenfernglas Porroprismen, benannt nach ihrem Erfinder Ignazio Porro, der sie 1854 patentieren ließ, sind die klassischen Umkehrprismen in einem traditionellen Feldstecher. Sie bewirken eine 180° Drehung des… … Deutsch Wikipedia
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
Abbe-Koenig prism — An Abbe Koenig prism is a type of reflecting prism used to invert an image (rotate it by 180°). They are commonly used in binoculars and some telescopes for this purpose. The prism is named after Ernst Abbe and Albert Koenig.The prism is made… … Wikipedia