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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 Fresnel lens is a compact lens that reduces the amount of material required compared to a conventional lens by dividing it into concentric sections. Learn about the invention by Augustin-Jean Fresnel, the different designs and uses of Fresnel lenses in lighthouses and other applications.
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.
Like the much more common optical lenses located between the objective lens group and the prism assembly method, this central internal focussing method does not change the volume of the binoculars. Bausch & Lomb Elite and Browning 7×35 binoculars, both made in Japan during the late 1980s to early 1990s, also used Uppendahl prisms.
Learn about optical coatings, thin layers of material that alter the way light reflects and transmits from optical components. Find out how metal coatings such as gold, silver and aluminium are used, and how they compare with dielectric coatings.
PRISM is a code name for a program under which the NSA collects internet communications from various U.S. internet companies. The program was leaked by Edward Snowden in 2013 and has been controversial for its scope, legality and impact on privacy.
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