Question

In the following ray diagram the correctly marked angles are.

• A. $\angle$ i and $\angle$ e
• B. $\angle$ A and $\angle$ D
• C. $\angle$ i, $\angle$ e and $\angle$ D
• D. $\angle$ r, $\angle$A and $\angle$ D

Answer 1

The correct option is D $\angle$ r, $\angle$A and $\angle$ D

$\angle A$ represents the angle of a prism while $\angle D$ represents the angle of deviation and both are correctly marked.

As angle of refraction $\left(\angle r\right)$ is the angle formed by the refracted ray with the normal and is also correctly marked.

But $\angle i$ and $\angle e$ are the angles made by the incident ray with the normal and emergent ray with the normal respectively and thus are incorrectly marked.

Hence option D is correct.