Question

Find the angle of refraction in the following figure?

• A. ${20}^{\circ }$
• B. ${65}^{\circ }$
• C. ${45}^{\circ }$
• D. ${30}^{\circ }$

Answer 1

The correct option is D

${30}^{\circ }$

Given, angle of incidence = ${30}^{\circ }$

In multiple refractions through a glass slab, if incident ray and emergent ray have the same medium, the rays will be parallel.
Hence, $\angle i$ = $\angle r$

Therefore, the angle of refraction ($\angle r$) is ${30}^{\circ }$