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Learn about the different types of corrective lenses, such as glasses, contact lenses, and intraocular lenses, and how they are prescribed by eye care professionals. Find out how they improve visual perception and treat refractive errors, and the advantages and disadvantages of over-the-counter and self-selected lenses.
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 dispersive prism is an optical device that uses refraction to split white light into its spectral components (the colors of the rainbow). Learn about the principle, types, history and applications of dispersive prisms, and how they differ from diffraction gratings and mirrors.
An extended hemispherical lens is a special type of plano-convex lens, in which the lens's curved surface is a full hemisphere and the lens is much thicker than the radius of curvature. Another extreme case of a thick convex lens is a ball lens, whose shape is completely round. When used in novelty photography it is often called a "lensball".
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.
Crown glass is a type of optical glass used in lenses and other optical components. It has low refractive index and low dispersion, and is produced from alkali-lime silicates containing potassium oxide. Borosilicate glass Schott BK7 is a common crown glass.
Learn about the origins and development of optics from ancient times to modern days. Explore the contributions of Greek, Roman, Islamic, and European scholars to the fields of geometrical, physical, and physiological optics.
Math Blaster! is a 1983 educational video game, and the first entry in the "Math Blaster" series within the Blaster Learning System created by Davidson & Associates. The game was developed by former educator Jan Davidson. [2] It would be revised and ported to newer hardware and operating systems, with enhanced versions rebranded as Math Blaster ...