Question

define:-principal axis​

Answer 1

Answer:

The imaginary line passing through the centre of curvature and pole is known as principal axis

Explanation:

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Answer 2

Answer:

THE LINE PASSING THROUGH OPTICAL CENTRE AND CENTRE OF CURVATURE IS KNOWN AS PRINCIPAL AXIS. ALSO KNOWN AS OPTICAL AXIS.

ALSO ANY IF THREE MUTUALLY PERPENDICULAR AXES ABOUT WHICH THE MOMENT OF INERTIA OF A BODY IS MAXIMUM.

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