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angle of deviation

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noun Optics.
  1. the angle equal to the difference between the angle of incidence and the angle of refraction of a ray of light passing through the surface between one medium and another of different refractive index.
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Origin of angle of deviation

First recorded in 1825–35
Also called deviation.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for angle of deviation

angle of deviation

noun
  1. the angle between the direction of the refracted ray and the direction of the incident ray when a ray of light passes from one medium to another
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012