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Question

White light is passed through a prism of angle 5. If the refractive indices for red and violet colours are 1.641 and 1.659 respectively, the angle of dispersion between them is


  1. 0.090
  2. 3.295
  3. 3.205
  4. None of these


Solution

The correct option is A 0.090

Angle of dispersion θ=δVδR
For a small angle prism of angle A, angle of deviation δ=(μ1)A
θ=(μV1)A(μR1)A=(μVμR)A
=(1.6591.641)5=0.090

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