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Geometrical Optics question

2011 · Q88
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Geometrical Optics question

2011 · Q88

NEETPhysicsGeometrical OpticsMCQ+4 / −1
A thin prism of angle 15o made of glass of refractive index μ\muμ1 = 1.5 is combined with another prism of glass of refractive index μ\muμ2 = 1.75. The combination of the prisms produces dispersion without deviation. The angle of the second prism should be
  1. A
    5o
  2. B
    7o
  3. C
    10o
  4. D
    12o
View written solutionFree

Correct answer: C

For without deviation

AA′=μ′−1μ−1{A \over {A'}} = {{\mu ' - 1} \over {\mu - 1}}A′A​=μ−1μ′−1​

⇒\Rightarrow⇒ 15A′=1.75−11.50−1{{15} \over {A'}} = {{1.75 - 1} \over {1.50 - 1}}A′15​=1.50−11.75−1​

⇒\Rightarrow⇒ A' = 10o

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