index of refraction

index of refraction
noun
the ratio of the velocity of light in a vacuum to that in a medium
Syn: ↑refractive index
Hypernyms: ↑ratio

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: the ratio of the velocity of light or other radiation in the first of two media to its velocity in the second as it passes from one into the other, the first medium being usually taken to be a vacuum — called also refractive index

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Optics.
a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light in a specified medium to that in the given medium (relative index of refraction). Symbol: n Also called index, refractive index.
[1820-30]

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index of refraction,
the ratio of the velocity of light in one medium, usually a vacuum or air, to its velocity in another of different density; refractive index.

Useful english dictionary. 2012.

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  • Index of refraction — Refraction Re*frac tion (r?*fr?k sh?n), n. [F. r[ e]fraction.] 1. The act of refracting, or the state of being refracted. [1913 Webster] 2. The change in the direction of ray of light, heat, or the like, when it enters obliquely a medium of a… …   The Collaborative International Dictionary of English

  • Index of refraction — Index In dex, n.; pl. E. {Indexes}, L. {Indices}(?). [L.: cf. F. index. See {Indicate}, {Diction}.] [1913 Webster] 1. That which points out; that which shows, indicates, manifests, or discloses; as, the increasing unemployment rate is an index of …   The Collaborative International Dictionary of English

  • index of refraction — n. the ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray of light crossing from one medium into another …   English World dictionary

  • index of refraction — n the ratio of the speed of radiation (as light) in one medium (as a vacuum) to that in another medium called also refractive index …   Medical dictionary

  • index of refraction — lūžio rodiklis statusas T sritis automatika atitikmenys: angl. index of refraction; refraction index; refractive index vok. Brechungsindex, m; Brechungsverhältnis, n; Brechungszahl, f; Brechzahl, f; Refraktionsindex, m rus. индекс преломления, m; …   Automatikos terminų žodynas

  • index of refraction — Optics. a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light in a specified medium to that in… …   Universalium

  • index of refraction — lūžio rodiklis statusas T sritis chemija apibrėžtis Medžiagos konstanta, apibūdinanti jos savybę laužti šviesos bangas. atitikmenys: angl. index of refraction; refraction index; refractive index rus. индекс преломления; коэффициент рефракции;… …   Chemijos terminų aiškinamasis žodynas

  • Index Of Refraction —    This is the measure of the refracting power of a transparent substance. It is the ratio of the speed of light in a vacuum compared to the speed of light as it passes through the transparent substance. See Invisible and Refraction …   The writer's dictionary of science fiction, fantasy, horror and mythology

  • index of refraction — Date: 1829 refractive index …   New Collegiate Dictionary

  • index of refraction — noun → refractive index …  

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