Question

Two plane mirrors are arranged at right angles to each other as shown in figure. A ray of light is incident on the horizontal mirror at an angle θ. For what value of θ the ray emerges parallel to the incoming ray after reflection from the vertical mirror :

(A)  60º

(B)  30º

(C)  45º 

(D)  All of the above

Answer 1

Correct option  (D) All of the above 

Explanation :

As shown in figure, both incident ray and reflected ray make same angle (90 – θ) with horizontal and one anti parallel for all values of θ.