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 $\theta$ . For what value of $\theta$ the ray emerges parallel to the incoming ray after reflection from the vertical mirror?

• A. ${60}^{\circ }$
• B. ${30}^{\circ }$
• C. ${45}^{\circ }$
• D. All of these

Answer 1

The correct option is D All of these



The incident and the second reflected ray make the same angle $\theta$ with vertical. Therefore, they are parallel for any value of $\theta$