Question

For a spherical mirror, the normal at the point of incidence is:

Options

• The tangent drawn to the mirror at the point of incidence

• The line joining the pole to the point of incidence

• The line joining the centre of curvature of the mirror to the point of incidence

• A line perpendicular to the principal axis drawn at the pole

Answer 1

For a spherical mirror, the normal at the point of incidence is along the radius, that is, the line joining the centre of curvature of the mirror to the point of incidence. It is neither the tangent at that point nor the line joining the pole to the point of incidence.