Question

For a given incident ray, a plane mirror is
turned through 25°. Find the angle through
which the reflected ray would turn. ​

Answer 1

Answer:

Consider a plane-mirror and a fixed incident ray of light reflecting from the surface at an angle . Before the mirror has rotated, the angle of incidence is is the angle of reflection. If the mirror is rotated through an angle the normal is rotated by an angle and thus the angle of incidence increases to +. Therefore, the angle of reflection must also increase by tow The difference between the final angle of reflection and the initial angle of reflection and is 25°