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noun
Optics,
Crystallography
.
the part of a doubly refracted ray whose velocity within a crystal is the same in any direction.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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ordinary ray
Collins
World English Dictionary
ordinary ray
—
n
double refraction
Compare
extraordinary ray
the plane-polarized ray of light that obeys the laws of refraction in a doubly-refracting crystal
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Ordinary ray
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"Flowers and fruits are always fit presents; flowers, because they are a proud assertion that a ray of beauty outvalues all of the utilities of the world. These gay natures contrast with the somewhat stern countenance of ordinary nature: they are like music heard out of a work-house."
-Ralph Waldo Emerson
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