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QJEEAdv08Ph4ff1: JEE Advanced 2008 Physics - Class 12 JEEAdv08Ph4ff1 Solution: Two beams of red and violet colours are made to pass separately …

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

Multiple Choice Options

  • A 30 ∘^\circ for both the colours
  • B greater for the violet colour
  • C greater for the red colour
  • D equal but not 30 ∘^\circ for both the colours

Step-by-Step Verified Solution

IIT-JEE 2008 Paper 1 Offline Physics - Geometrical Optics Question 12 English Explanation 1

IIT-JEE 2008 Paper 1 Offline Physics - Geometrical Optics Question 12 English Explanation 2

For minimum deviation, the ray in the prism is parallel to base of the prism. This condition does not depend on the colour (i.e., wavelength of incident radiation. So, both the cases, by geometry, r=30∘r=30^\circ .

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