Question

If the angle of reflection is ${60}^{\circ }$, then the angle between the incident ray and the mirror will be

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

Answer 1

Answer: (A)

${30}^{\circ }$

We know, the angle of incidence is equal to angle of reflection.

The angle of reflection is ${60}^{\circ }$. So angle of incident will be ${60}^{\circ }$.
And normal makes ${90}^{\circ }$ with the mirror.
Therefore, ${90}^{\circ }-{60}^{\circ }={30}^{\circ }$

So, the angle between incident ray and mirror will be ${30}^{\circ }$