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English to English noun
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in a doubly refracting crystal, the line in the direction of which no double refraction occurs |  | Example: a crystal may have either one or two optic axes
source: wordnet30
| 2 |
a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted | | Example: in a normal eye the optic axis is the direction in which objects are seen most distinctly
source: wordnet30
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