A thin prism having refracting angle 10 o is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

Question

A thin prism having refracting angle 10 o is made of glass of refractive index 1.42. This prism is combined with another thin prism made of glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be, 4 o, 6 o, 8 o, 10 o

MARKS App · Accepted Answer

For dispersion without deviation μ - 1 A + μ ′ - 1 A ′ = 0 μ - 1 A = μ ′ - 1 A ′ 1.42 - 1 × 10 o = 1.7 - 1 A ′ 4.2 = 0.7 A ′ A ′ = 6 o

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