what is principal axis.....
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a line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror is called principal axis
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An optical axis is a line along which there is some degree of rotational symmetry in an optical system such as a camera lens, microscope or telescopic sight. The optical axis is an imaginary line that defines the path along which light propagates through the system, up to first approximation
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