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Synonyms for optic-axis

Noun

1. optic axis, axis
usage: 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"
2. principal axis, optic axis, axis
usage: 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"
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