extraordinary ray

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

Origin:
1870–75

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World English Dictionary
extraordinary ray
 
n
optics double refraction Compare ordinary ray the plane-polarized ray of light that does not obey the laws of refraction in a doubly refracting crystal

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Example sentences
The ordinary ray's polarization is perpendicular to the axis of the crystal, and the extraordinary ray's polarization is parallel.
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