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double refraction

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noun Optics.
  1. the separation of a ray of light into two unequally refracted, plane-polarized rays of orthogonal polarizations, occurring in crystals in which the velocity of light rays is not the same in all directions.
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Origin of double refraction

First recorded in 1870–75
Also called birefringence.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for double refraction

double refraction

noun
  1. the splitting of a ray of unpolarized light into two unequally refracted rays polarized in mutually perpendicular planesAlso called: birefringence
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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