What is principal axis...?
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. principal axis - 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" optic axis. axis - a straight line through a body or figure that satisfies certain conditions.
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the line which is in between of any cirle is a principal axis on which it rotates
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