Question

A ray of light incident on a concave mirror after passing through the centre of curvature is reflected back along the same path. what is the angle of incidence ?​

Answer 1

Answer:

In geometric optics, the angle of incidence is the angle between a ray incident on a surface and the line perpendicular to the surface at the point of incidence, called the normal. ... The angle of incidence at which light is first totally internally reflected is known as the critical angle.