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.