Q

Which statements about the principal axis are true? (i) It is normal to the mirror. (ii) The point of incidence always lies on it. (iii) The principal focus always lies on it.

RRB Group-D 17/08/2022 / Shift-I 2022
✓ Answer: B Both i and iii
The principal axis is normal at the pole and contains the principal focus. An arbitrary point of incidence need not lie on it.
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