optic axis

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optic axis

n.
An optical path through a crystal along which a ray of light can pass without undergoing double refraction.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

optic axis

n
(General Physics) the direction in a uniaxial crystal or one of the two directions in a biaxial crystal along which a ray of unpolarized light may pass without undergoing double refraction
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

op′tic ax′is


n.
the direction or directions in a crystal along which light is not doubly refracted.
[1655–65]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.optic axis - in a doubly refracting crystal, the line in the direction of which no double refraction occurs; "a crystal may have either one or two optic axes"
axis - a straight line through a body or figure that satisfies certain conditions
2.optic axis - a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly"
axis - a straight line through a body or figure that satisfies certain conditions
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References in periodicals archive ?
In this paper, Fresnel coefficients for three-layered uniaxially anisotropic media with arbitrarily oriented optic axes are obtained using half-space reflection and transmission coefficients.
After molting, the optic axes of the ommatidia change, and an increasing percentage of ommatidia "look" posteriorly (5).
By changing the orientation of the molt, we measured the optic axes of numerous ommatidia and determined the visual field of the eye as well as its resolution in various parts of the visual field.