A Ray of a light incident on the equilateral prism of retractive index 1.5 at an angle 45^∘ calculate the angle of deviation does this represent minimum deviation?

Question:
A Ray of a light incident on the equilateral prism of retractive index 1.5 at an angle 45∘ calculate the angle of deviation does this represent minimum deviation?

Solution

A = 600 (For Equilateral Triangle)

μ₁sini = μ₂sin

1sin45⁰ = 2sin

= 30⁰

r₁ = 30

∴ i₁ = 45⁰

∴ δ = θ₀ + θ₀₁ - A

= 45⁰ + 45⁰ - 60

= 30⁰