define principal axis
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HEY MATE YOUR ANSWER IS HERE....
PRINCIPAL AXIS :-
A straight line passing through the optical Centre(for lens) or the pole (for mirror) is called as principal axis.
In sign conventions for mirrors and lens it is considered as frame of reference.
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hey mat here is your answer
principal axis:-each of three mutually perpendicular axes in a body about which the moment of inertia is at a maximum.
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