Question

According to the laws of reflection, the incident ray, the reflected ray, and the normal to the reflecting surface at the point of incidence:

Options

• Are mutually perpendicular to one another

• Are always collinear

• Lie in the same plane

• Lie in three different planes

Answer 1

A law of reflection requires that the incident ray, the reflected ray, and the normal to the reflecting surface at the point of incidence all lie in the same plane. This coplanarity condition, together with the equality of the angles of incidence and reflection, describes reflection.