refraction, refract

refraction, refract
   Refraction is the change in direction which occurs when rays of light pass from one medium to another of a different density, as they do from air to glass or water. Or, the distortion of an image by seeing through a translucent medium. To refract is to cause such a change in the direction of light. Ophthalmology is concerned with the eye's refractive ability: changing the direction of light in order to focus it on the retina. An ophthalmologist measures this refractive ability, resulting in an accurate prescription for lenses which will optically compensate for the eye's inability to achieve focus. Also see angle, mother-of-pearl, point of view, reflection, refractory, telescope, and wavelength.

Glossary of Art Terms. 2014.

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  • refract — (v.) 1610s, from L. refractus, pp. of refringere (see REFRACTION (Cf. refraction)). Related: Refracted; refracting …   Etymology dictionary

  • refract — [ri frakt′] vt. [< L refractus, pp. of refringere, to turn aside < re , back + frangere, to BREAK] 1. to cause (a ray or wave of light, heat, or sound) to undergo refraction 2. Optics to measure the degree of refraction of (an eye or lens)… …   English World dictionary

  • refraction — [ri frak′shən] n. [LL refractio] 1. the bending of a ray or wave of light, heat, or sound as it passes obliquely from one medium to another of different density, in which its speed is different, or through layers of different density in the same… …   English World dictionary

  • refraction correction — noun (astronomy) The correction made in the calculation of the altitude of a star, planet, etc to allow for the refraction of its light by the earth s atmosphere • • • Main Entry: ↑refract …   Useful english dictionary

  • Refraction — For the property of metals, see refraction (metallurgy). For the magic effect, see David Penn (magician). For the refraction in atmosphere, see Atmospheric refraction. Light on air–plexi surface in this experiment mainly undergoes refraction… …   Wikipedia

  • refraction — refractional, adj. /ri frak sheuhn/, n. 1. Physics. the change of direction of a ray of light, sound, heat, or the like, in passing obliquely from one medium into another in which its wave velocity is different. 2. Ophthalm. a. the ability of the …   Universalium

  • Refraction — In ophthalmology, the bending of light that takes place within the human eye. Refractive errors include nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. Lenses can be used to control the amount of refraction, correcting… …   Medical dictionary

  • refract — transitive verb Etymology: Latin refractus, past participle of refringere to break open, break up, from re + frangere to break more at break Date: 1612 1. a. to subject (as a ray of light) to refraction b. to alter or distort as if by refraction… …   New Collegiate Dictionary

  • refract — [[t]rɪfræ̱kt[/t]] refracts, refracting, refracted V ERG When a ray of light or a sound wave refracts or is refracted, the path it follows bends at a particular point, for example when it enters water or glass. [V n] As we age the lenses of the… …   English dictionary

  • refraction — re•frac•tion [[t]rɪˈfræk ʃən[/t]] n. 1) opt phs the change of direction of a ray of light, sound, heat, or the like, in passing obliquely from one medium into another in which its wave velocity is different 2) oph a) the ability of the eye to… …   From formal English to slang

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