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optic axis is a noun meaning "in a doubly refracting crystal, the line in the direction of which no double refraction occurs". It carries 2 recorded senses.
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”
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”
Definitions, synonyms and semantic relations for optic axis come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.