| NOUN | cognition | optic axis | in a doubly refracting crystal, the line in the direction of which no double refraction occurs |
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| cognition | optic axis, principal axis | a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted |
| Meaning | In a doubly refracting crystal, the line in the direction of which no double refraction occurs. | |
|---|---|---|
| Broader | axis | A straight line through a body or figure that satisfies certain conditions |
| Meaning | 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" | |
| Synonym | principal axis | |
| Broader | axis | A straight line through a body or figure that satisfies certain conditions |
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