Question

In the given figure, a ray of light falls obliquely on a vertical glass slab and after refractive from slab falls on a vertical plane mirror at angle $x$.
The value of $x$ is

• A. ${30}^o$
• B. ${60}^o$
• C. ${45}^o$
• D. ${70}^o$

Answer 1

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

As the incident ray and the emergent ray are parallel to each

other so here the emergence angle will also be ${30}^0$

and by geometry the angle $x$ will also be ${30}^0$.

Hence, Option $A$ is correct.