Q1) Multiple choice questions [4 marks ] i) The straight line passing through pole and centre of curvature of mirror is called a) Principal axis b) Focus c) Pole d) sphere
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THE STRAIGHT LINE PASSING THROUGH THE POLE AND CENTRE OF CURVATURE OF MIRROR IS CALLED PRINCIPAL AXIS .
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Principal axis: The straight line joining the pole (P) and the centre of curvature. It is normal to the mirror at its pole.
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