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JEE Advanced2008PhysicsRay OpticsActual

Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60^ ). In the position of minimum deviation, the angle of refraction will be

Options

  1. A30^ for both the colours
  2. Bgreater for the violet colour
  3. Cgreater for the red colour
  4. Dequal but not 30^ for both the colours

Correct answer

A. 30^ for both the colours

Step-by-step solution

At minimum deviation ( = _m ) : r₁=r₂= A 2 = 60^ 2 =30^ (For both colours) correct answer is (a).

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