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"
principal axis, optic axis(noun)
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"
The numerical value of optic axis in Chaldean Numerology is: 6
The numerical value of optic axis in Pythagorean Numerology is: 8
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