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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.
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.
A periscope is an instrument for observation over, around or through an object that prevents direct line-of-sight observation. Learn about the principle, history and types of periscopes, such as mirrors, prisms, lenses and binoculars, and their applications in military, submarine and science fields.
Learn about glasses, also known as eyeglasses and spectacles, which are vision eyewear with clear or tinted lenses mounted in a frame. Find out about corrective, safety, sunglasses and other types of glasses, as well as their history and evolution.
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.
Foxit PDF Reader is a freemium tool that can create, view, edit, and print PDF files. It is developed by Foxit Software and supports various platforms, including Windows, Mac OS, Android, and iOS.
8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
Learn how polarized glasses create the illusion of three-dimensional images by restricting the light that reaches each eye. Compare different types of polarized glasses, such as linearly and circularly polarized, and their advantages and disadvantages.