Which of the following line(s) act as a normal to a spherical mirror?
(i) Line joining the pole and centre of curvature
(ii) Line joining the centre of curvature and point of incidence
(iii) Line joining focus and point of incidence

Correct option is A

The correct answer is (A) Both (i) and (ii).

·         In the context of a spherical mirror, a normal is an imaginary line drawn perpendicular to the mirror's surface at the point of incidence.

·         For spherical mirrors, the radius of curvature is always normal to the surface.

Detailed Analysis of Each Statement:

• Line joining the pole and the centre of curvature:
• Not entirely true: While this line (principal axis) is important, it does not directly define the normal for every point on the mirror.
• Line joining the centre of curvature and point of incidence:
• Correct: This line represents the radius of curvature, which is perpendicular (normal) to the mirror's surface at the point of incidence.
• Line joining the focus and point of incidence:
• Incorrect: The focus is not involved in determining the normal for spherical mirrors. The normal is solely dependent on the centre of curvature.