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Per NCERT, what is the PRINCIPAL AXIS of a spherical mirror?
AAny line through the mirror
BA line along the edge of the mirror
CA vertical line in the room
DA straight line passing through the POLE (P) and the CENTRE OF CURVATURE (C) of the mirror — normal to the mirror at its pole
Answer & Solution
Correct answer: D. A straight line passing through the POLE (P) and the CENTRE OF CURVATURE (C) of the mirror — normal to the mirror at its pole
Per NCERT §9.2, principal axis = line through P and C. The other options misstate.
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