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http://en.wikipedia.org/wiki/Double_Refraction
The property of separating a single ray of light into two.
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http://www.agt-gems.com/Book/Glossary/
an optical property in which a single ray of unpolarized light entering an anisotropic medium is split into two rays, each traveling in a different ... [11 related articles]
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http://www.britannica.com/eb/a-z/d/69
Double refraction displayed by a crystal of Iceland spar Also called birefringence, the splitting of a light wave into two waves, traveling at different speeds, by an optically anisotropic medium such as a crystal of Iceland spar (calcite), quartz, or topaz. In the phenomenon of double refractio...
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http://www.daviddarling.info/encyclopedia/D/double_refraction.html
<microscopy> The refraction of light in two slightly different directions to form two rays or vector components. Each ray is polarized, and their vibration directions are perpendicular to each other. Furthermore, each ray has a different velocity, and therefore a different refractive index. ... See: birefringence. ... (05 Aug 1998) ...
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http://www.encyclo.co.uk/local/20973
refraction in which incident rays are divided into two refracted rays.
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http://www.encyclo.co.uk/local/21001
The separation of a beam of light into two separatebeams as it enters a gemstone. The two beams travel at differentspeeds. May be used to distinguish one gemstone material fromanother. Occurs in all crystal systems except Isometric.
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http://www.encyclo.co.uk/local/22148
Phenomenon exhibited on all non-opaque minerals except for amorphous ones and ones that crystallize in the isometric system. A light ray enters the crystal and splits up into two separate rays, making anything observed through the crystal appear as double. The double refraction on most minerals is so weak that it cannot be observed without special...
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http://www.encyclo.co.uk/local/22291
Type: Term Definitions: 1. the property of having more than one refractive index according to the direction of the transmitted light. Synonyms: birefringence
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http://www.medilexicon.com/medicaldictionary.php?t=77009
[
n] - splitting a ray into two parallel rays polarized perpendicularly
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http://www.webdictionary.co.uk/definition.php?query=double%20refraction
birefringence noun splitting a ray into two parallel rays polarized perpendicularly
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https://www.encyclo.co.uk/local/20974
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. Also called
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https://www.infoplease.com/dictionary/double-refraction
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