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JEE Main201911 Jan 2019Evening ShiftPhysicsRay OpticsActual

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 :

Options

  1. A90^
  2. B30^
  3. C60^
  4. D45^

Correct answer

C. 60^

Step-by-step solution

For minimum deviation: r ₁= r ₂= A 2 =30^ by Snell's law ₁ i = ₂ r 1 i= 3 1 2 = 3 2 i=60

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