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Byju's Answer
Standard IX
Physics
Important Terms Related to Spherical Mirror
Define Princi...
Question
Define Principal axis
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Solution
PRINCIPAL AXIS:-
The imaginary straight line passing through the centre of curvature and the pole of a spherical mirror is called its
principal axis.
Principal axis is normal to the spherical mirror at its pole
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Define the following terms for a lens:
(a) optical centre
(b) principal axis
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