Question

When a ray of light strikes a plane mirror at an angle of ${15}^o$ with the mirror, what will be the angle through which the ray gets deviated ?

• A. ${15}^o$
• B. ${30}^o$
• C. ${75}^o$
• D. None of these

Answer 1

The correct option is B ${30}^o$

A ray of light that is incident on to the surface of a plane-mirror is reflected with the angle of incidence equal to the angle of reflection. Suppose that the ray had continued, through the mirror, in a straight line it would make an angle θ with the surface of the mirror. The total angle between the straight-line path and the reflected ray is twice the angle of incidence. This is called the deviation of the light and measures the angle at which the light has strayed from its initial straight-line path.

The deviation of a mirror is equal to twice the angle of incidence.
so
Angle of deviation=