Question

what do you mean by principal axis?​

Answer 1

Answer:

each of three mutually perpendicular axes in a body about which the moment of inertia is at a maximum.

Explanation:

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Answer 2

$\huge\purple{Answer}$

A line passing through the centre of the surface of a spherical mirror or lens and through the centre of curvature of all segments of the mirror or lens is called principal axis.