Question

In an equilateral prism , the angle of refraction at the first refracting surface is 25 degree .The angle of refraction at the second refracting surface is :-
(a) :- 25°
(b) :- 20°
(c) :- 35°
(d) :- 18°​

Answer 1

Answer:

The angle of refraction at the second refracting surface is c)  35°

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Answer 2

Answer:

The angle of refraction at the second refracting surface is 35°

Explanation:

We know that,

Equilateral Prism has 3 equal angles, each having 60°, i.e, ∠A = 60°

Now, given:

The angle of refraction at the first refracting surface ( ∠$r_{1}$ ) = 25°

∴ ∠A = ∠$r_{1}$ + ∠$r_{2}$

⇒ 60° = 25° + ∠$r_{2}$

⇒ ∠$r_{2}$  = 60° - 25°

∴ ∠$r_{2}$  = 35°

The angle of refraction at the second refracting surface is 35°