question_answer

A parallel beam of light strikes a (i) plane mirror (ii) concave mirror and (iii) convex mirror. What is the deviation produced in each case in terms of the angle of incidence?

Answer:

                Angle of deviation in each \[\text{case }=\text{ 18}0{}^\circ \text{ }-\text{ 2i}\]. For a ray striking normally on a plane mirror or travelling along the principal axis of a spherical mirror, \[i={{0}^{\circ }}\] , so angle of deviation\[=\text{ 18}0{}^\circ \].