A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is 3 , then the angle of i

Question

A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is 3 ​ , then the angle of incidence is :

TestHub · Accepted Answer

For minimum deviation: r 1 ​ = r 2 ​ = 2 A ​ = 3 0 ∘ by Snell's law μ 1 ​ sin i = μ 2 ​ sin r 1 × sin i = 3 ​ × 2 1 ​ = 2 3 ​ ​ ⇒ i = 60

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