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Geometrical Optics question

2017 · Q137
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Geometrical Optics question

2017 · Q137

NEETPhysicsGeometrical OpticsMCQ+4 / −1
A thin prism having refracting angle 10o is made of glass of refractive infex 1.42. This prism is combined with another thin prism of glass of refractive index 1.7. This combination producess dispersion without deviation. The refracting angle of second prism should be
  1. A
    6o
  2. B
    8o
  3. C
    10o
  4. D
    4o
View written solutionFree

Correct answer: A

The condition for dispersion without deviation is given as

|(μ\mu μ – 1)|A = |(μ\mu μ' – 1)| A'

⇒\Rightarrow⇒ (1.42 – 1) × 10o = (1.7 – 1)A'

⇒\Rightarrow⇒ 4.2 = 0.7A' or A' = 6o

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