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dou'ble refrac'tion



Optics.
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 birefringence.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

double-reeddouble-ring
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