NEET | 2017Geometrical OpticsHard

Question

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

Options

A.

6o

B.

8o

C.

10o

D.

4o

Solution

For dispersion without deviation
δ1=δ2
A1(μ1 - 1) = A2 (μ2-1)
10(1.42 - 1) = A2 (1.7 - 1)
A2 = 6o

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