primary optic axis
primary optic axis
[′prī‚mer·ē ′äp·tik ‚ak·səs] (optics)
One of two optic axes in a crystal that are perpendicular to the circular sections of the indicatrix and along which all light rays travel with equal velocity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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