Question

what do you understand by principal axis​

Answer 1

Explanation:

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

..another term for optical axis.

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Answer 2

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$\Large\fbox{\color{purple}{CORRECT \: QUESTION}}$

DEFINE THE FOLLOWING TERMS IN RELATION TO SPHERICAL MIRRORS

• PRINCIPAL AXIS

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$\Large\fbox{\color{purple}{ SOLUTION }}$

★ PRINCIPAL AXIS ★

THE STRAIGHT LINE THAT GOES TO THE CENTRE OF THE SPHERICAL MIRROR AT RIGHT ANGLE TO THE MIRROR IS CALLED PRINCIPAL AXIS

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