Which of the following statements is/are true about the principal axis of a spherical mirror?
(i) It is normal to the mirror
(ii) Point of incidence always lies on the principal axis
(iii) Principal focus always lies on the principal axis
The correct answer is option (b) Both (i) and (iii)
Statement (i) is true because the principal axis is perpendicular (normal) to the mirror at the pole.
Statement (iii) is true because the principal focus is always on the principal axis.
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