Question

What is the value of x in the figure shown?

• A. ${30}^{\circ }$
• B. ${90}^{\circ }$
• C. ${60}^{\circ }$
• D. ${45}^{\circ }$

Answer 1

The correct option is C

${60}^{\circ }$

Law of reflection states

∠i = ∠r = ${30}^{\circ }$

Also, we know the normal makes an angle of 90° at the surface.

⇒ x + ${30}^{\circ }$ = ${90}^{\circ }$

⇒ x = ${60}^{\circ }$