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Definition of Principal axis
1. 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"
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1. 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"