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A Porro prism is a reflection prism that rotates and displaces an image by 180°. It is used in optical instruments such as binoculars, telescopes and cameras, and has different variants and designs.
Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.
Perger-Prism beam path; the cemented plane is colored blue Leica GEOVID 8×42 HD-B laser rangefinding "Perger–Porro prism system" binoculars that have a 14 mm (0.55 in) eyepiece/objective axis offset used by a hunter. A Perger prism or Perger–Porro prism system is a prism, that is used to invert
A Fresnel rhomb is an optical prism that introduces a 90° phase difference between two perpendicular components of polarization, by means of two total internal reflections. Learn about its operation, history, and applications in polarization experiments and devices.
A Fresnel lens is a type of lens that reduces the amount of material required compared to a conventional lens by dividing it into concentric sections. Learn about its invention by Augustin-Jean Fresnel for lighthouses, its different types and applications in illumination, imaging and solar power.
Learn about the different types of optical prisms, such as dispersive, reflective, beam-splitting and polarizing prisms, and how they refract, reflect or split light. Find out how prisms are made of transparent materials like glass, acrylic or fluorite, and how they can create spectra, images or polarizations.
A 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 prism configuration. [1]
Binoculars are two telescopes aligned to point in the same direction, allowing binocular vision for viewing distant objects. Learn about the optical design evolution, from Galilean to Porro to roof prism, and the advantages and disadvantages of each type.
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