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

Explanation

The line(s) that act as a normal to a spherical mirror are: 1. (i) Line joining the pole and center of curvature: This line passes through the center of curvature, making it the principal normal to the spherical mirror. 1. (ii) Line joining the center of curvature and point of incidence: At any point on the mirror, the line joining that point to the center of curvature is perpendicular to the mirror surface, making it a normal at the point of incidence. 1. (iii) Line joining focus and point of incidence: This line does not act as a normal because it does not pass through the center of curvature. Conclusion: The correct lines that act as normals to a spherical mirror are: (i) Line joining the pole and center of curvature (ii) Line joining the center of curvature and point of incidence