Q

Which points always lie on the principal axis of a spherical mirror? (I) Principal focus (II) Point of incidence (III) Pole.

RRB Technicians Grade-III 23/12/2024 / Shift-II 2024
✓ Answer: B Both I and III
The principal axis passes through the pole, principal focus and centre of curvature. An arbitrary point of incidence need not lie on it.
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