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Encyclopedia > Amici roof prism

An Amici roof prism, named for its inventor, the Italian astronomer Giovanni Amici, is a type of reflecting prism used to deviate a beam of light by 90° whilst simultaneously inverting the image. It is commonly used in the eyepieces of telescopes as an image erecting system. An astronomer or spmething i cant inderstand is a scientist whose area of research is astronomy or astrophysics. ... Giovanni Battista Amici (March 25, 1786 - 1863) was an Italian astronomer and microscopist. ... This article needs a complete rewrite for the reasons listed on the talk page. ... 50 cm refracting telescope at Nice Observatory. ...

The device is shaped like a standard right-angled prism with an additional "roof" section (consisting of two faces meeting at a 90° angle) on the longest side. Total internal reflection from the roof section flips the image laterally. The handedness of the image is unchanged. The larger the angle to the normal, the smaller is the fraction of light transmitted, until the angle when total internal reflection occurs. ... // What makes you right- or left-handed? == It has been known since Darwins day that left-handedness in humans runs in families, but it is not a simple system. ...

The roof faces of the prism are sometimes coated to provide mirror surfaces. This allows the prism to be used with a wider range of beam entrance angles without being limited by total internal reflection. An optical coating is a thin layer of material placed on an optical component such as a lens or mirror which alters the way in which the optic reflects and transmits light. ... A mirror is a reflective surface that is smooth enough to form an image. ...

The non-dispersive Amici roof prism should not be confused with the dispersive double Amici prism. In optics, dispersion is a phenomenon that causes the separation of a wave into spectral components with different frequencies, due to a dependence of the waves speed on its frequency. ...

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