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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.
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame. They can be used for vision correction, eye protection, cosmetic purposes, or viewing specific visual information.
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.
Learn about the different optical designs, evolution and uses of binoculars, or field glasses, which are two refracting telescopes aligned to point in the same direction. Find out how binoculars give users a three-dimensional image and how they are used for bird watching, hunting, astronomy and more.
Dispersion is the phenomenon of wave velocity depending on frequency, causing different colors to refract at different angles. Anomalous dispersion occurs when the refractive index increases with wavelength, such as in the ultraviolet region, while normal dispersion occurs when it decreases with wavelength, such as in visible light.
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.
The game board consists of a number of modular map tiles, which, with the exception of each civilization's unique starting map tile, are placed face-down on the board. At the start of the game, each player begins with a capital city in the centre of their own map tile, and an army and scout unit that begins in a space bordering their capital city.
A prism sight is a type of telescopic sight that uses a reflective prism instead of lenses. Learn about its advantages, disadvantages, magnification, reticle, diopter, parallax and eye relief, and its use in war and hunting.