In optics, a Mangin mirror is a negative meniscus lens with the reflective surface on the rear side of the glass forming a curved mirror that reflects light without spherical aberration. This reflector was invented in 1876 by a French officer Alphonse Mangin as an improved catadioptric reflector for search lights and is also used in other optical devices.
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... inventions such as the Catadioptric Mangin mirror (1874), Schmidt camera (1931), and the Maksutov telescope (1941) along with Laurent Cassegrain's Cassegrain telescope (1672) ... folded system and extending the light cone to a focal point well behind the primary mirror so it can reach the film plane of the attached camera ... face and the back spherical surface silvered to make the "mirror") ...
... Mangin mirrors are used in illumination and image forming optics such as search lights, headlamps, aircraft gunsights and head-mounted displays ... reflective coating on the backside that are referred to as "Mangin mirrors", although they are not single-element objectives like the original Mangin, and some, like the ... Catadioptric mirrors similar to the Mangin are found in the Klevtsov–Cassegrain, Argunov–Cassegrain telescopes, and Ludwig Schupmann's Schupmann medial telescope ...
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