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Question
A ray PQ is incident normally on the face AB of a triangular prism of refracting angle 60° as shown in figure. The prism is made of a transparent material of refractive index
Solution
Given: ∠A = 60°, ∠i = 0°
At M: Sin C =
∴ C = 60°
So the ray PM after refraction from the face AC grazes along AC.
∴ ∠C = 90°
From ∠i + ∠C = ∠A + ∠δ
Or 0° + 90° = 60° + ∠δ
∴ δ = 90° – 60° = 30°
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