extraordinary ray

noun Optics, Crystallography.
  1. the part of a doubly refracted ray that has changed speed and vibrations in the principal plane of the crystal.

Origin of extraordinary ray

First recorded in 1870–75
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British Dictionary definitions for extraordinary ray

extraordinary ray

  1. optics the plane-polarized ray of light that does not obey the laws of refraction in a doubly refracting crystalCompare double refraction, ordinary ray
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