A ray of light is incident on a plane mirror, making an angle 'q' with the surface of the mirror. Arrange the following steps in sequential order to calculate the angle between the incident light ray and the reflected light ray.
(A) Draw a normal line on the plane mirror at the point of incidence of the light ray.
(B) Note down the angle between the plane mirror and the incident light ray.
(C) The sum of the angle of incidence and the angle between the plane mirror and the incident ray is `90^(@)`.Determine the angle of incidence.
(D) From the laws of reflection, the angle of incidence is equal to the angle of reflection. Then the sum of the angle of incidence and the angle of reflection gives the angle between the incident light ray and the reflected light ray.

Options

A. DACB
B. CDAB
C. BACD
D. DBAC

Answer

C

Explanation

Note down the given angle, i.e., the angle between the incident light ray and the plane mirror. Draw a normal line on the plane mirror at the point of incidence. The sum of the angle between the normal and the incident light ray and the angle between the plane mirror and the incident light ray is `90^@` . From this, determine the angle of incidence. From the laws of reflection the angle of incidence is equal to the angle of reflection. Then the sum of the angle of incidence and the angle of reflection gives the angle between the incident light ray and the reflected light ray.