Question

In the following cases, a ray is incident on a concave mirror. In which case is the angle of incidence equal to zero?

Options

• A ray parallel to the principal axis.

• A ray passing through the centre of curvature and incident obliquely.

• A ray passing through the principal focus and incident obliquely.

• A ray incident obliquely to the principal axis, at the pole of the mirror.

Answer 1

A ray passing through the centre of curvature and incident obliquely.