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Optical glass is a type of glass suitable for optical systems such as lenses, prisms or mirrors. It contains additives to modify its optical or mechanical properties, such as refractive index, dispersion, transmittance and thermal expansion.
A familiar dispersive prism. An optical prism is a transparent optical element with flat, polished surfaces that are designed to refract light. At least one surface must be angled — elements with two parallel surfaces are not prisms. The most familiar type of optical prism is the triangular prism, which has a triangular base and rectangular ...
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.
Prisms are sometimes used for the internal reflection at the surfaces rather than for dispersion. If light inside the prism hits one of the surfaces at a sufficiently steep angle, total internal reflection occurs and all of the light is reflected. This makes a prism a useful substitute for a mirror in some situations.
Refraction is the redirection of a wave as it passes from one medium to another, such as light in air, water or glass. Learn how refraction depends on the wave speed, the angle of incidence and the refractive index, and see how it affects phenomena like rainbows, prisms and optical devices.
Use Night Settings. If you think the blue light from your screens keeps you up at night, the remedy may be as simple as changing the device's mode. These devices come equipped with dark or night ...
Learn about the origins and development of optics from ancient times to modern days. Find out who are the pioneers of geometrical optics, physical optics, and modern optics, and what are their contributions and discoveries.
Chromatic aberration, also called color fringing, is a failure of a lens to focus all colors to the same point. Learn about the types, causes, and minimization methods of this optical phenomenon, and see examples and applications.
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