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A thin prism P ₁ with angle 4^ made of glass having refractive index 1.54 , is combined with another thin prism P ₂ made of glass having refractive index 1.72 to get dispersion without deviation. The angle of the prism P₂ in degrees is

Options

  1. A3
  2. B16/3
  3. C4
  4. D1.5

Correct answer

A. 3

Step-by-step solution

For dispersion without deviation, aligned & ( ₁-1 ) A₁= ( ₂-1 ) A₂ & (1.54-1) 4^ =(1.72-1) A₂ & Or A₂= 0.54 0.72 4=3^ aligned

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