Question

Which of the following is correct when deviation is minimum regarding an equilateral prism of angle A :

(1) i = e

(2) Ray inside prism becomes parallel to base of prism.

(3) More is ‘A’, smaller is deviation.

(4) All of these

Answer 1

Correct option is : (4) All of these

From condition of minimum deviation

i = e

Ray inside prism becomes parallel to base of prism.

\(\delta = (i + e)-A\)

\(\delta = 2i - A\)

So, More is 'A', smaller is deviation.