Question

The angle between the normal and the reflected ray is ${40}^{\circ }$. Then the angle of incidence will be

• A. ${50}^{\circ }$
• B. ${20}^{\circ }$
• C. ${40}^{\circ }$
• D. Can't be predicted

Answer 1

Answer: (C)

${40}^{\circ }$

We know, the angle between the normal and the reflected ray is called as angle of reflection $\angle r$.
We also know, from the laws of reflection, that

$\angle i=\angle r$

Given,

$\angle r={40}^{\circ }$

$\Rightarrow \angle i={40}^{\circ }$
$\therefore$ The angle of incidence is ${40}^{\circ }$

Hence, the correct answer is OPTION C.