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refraction
(Encyclopedia) refraction, in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from…focus
(Encyclopedia) focus, in optics, the point at which rays converge after reflection by a concave mirror or refraction by a convex lens, also known as a real focus. The point from which rays appear to…Snell's law
(Encyclopedia) Snell's law: see refraction.optical density
(Encyclopedia) optical density: see refraction.critical angle
(Encyclopedia) critical angle: see refraction.Malus, Étienne Louis
(Encyclopedia) Malus, Étienne LouisMalus, Étienne Louisātyĕnˈ lwē mälüsˈ [key], 1775–1812, French artillery officer and physicist. In 1810 he stated his discovery of the polarization of light by…Snell, Willebrord
(Encyclopedia) Snell or Snellius, WillebrordSnell or Snellius, Willebrordvĭlˈəbrôrt snĕl, snĕlēəs [key], 1591–1626, Dutch mathematician. He is generally credited with the discovery (1621) of the law…moonstone
(Encyclopedia) moonstone, an orthoclase feldspar, found in Sri Lanka, Myanmar, and Madagascar (and formerly in the St. Gotthard district of Switzerland). In spite of its pronounced cleavage, it is…celestial horizon
(Encyclopedia) celestial horizon, one axis of the altazimuth coordinate system. It is the great circle on the celestial sphere midway between the observer's zenith and nadir; it divides the celestial…Gullstrand, Allvar
(Encyclopedia) Gullstrand, AllvarGullstrand, Allvarälˈvär gŭlˈstränd [key], 1862–1930, Swedish ophthalmologist. He was professor (1894–1927) successively of eye therapy and of optics at the Univ. of…Trending
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