Question

For a prism in the position of the minimum deviation,

• A. $\angle e<\angle i$
• B. $\angle \delta =\angle i$
• C. $\angle e=\angle i$
• D. $\angle e>\angle i$

Answer 1

The correct option is C

$\angle e=\angle i$

The explanation for the correct answer,

1. The angle of deviation decreases first when the incident angle is increased.
2. When the angle of deviation is minimum then the angle of emergence equals the incident angle.
3. Therefore, at the minimum deviation position, $\angle e=\angle i$

Thus, option (c) is correct.