Question

explain about principal axis and random circles don't spam who will say right answer then I will follow u​

Answer 1

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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. Physics. one of three mutually perpendicular axes of a body about which the moment of inertia is maximum or minimum.

Answer 2

The line passing through the optical centre and centres of curvature of the faces of a lens or a curved mirror. 2. any of three mutually perpendicular axes about which the moment of inertia of a body is maximum.