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A thin prism P1 having angle 4° and refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72 for producing dispersion without deviation. The angle of P2 is?

A thin prism P1 having angle 4° and refractive index 1.54 is combined with another thin prism P2 of refractive index 1.72 for producing dispersion without deviation. The angle of P2 is? Correct Answer 3°

Since, (µ1 – 1)A1 = (µ2 – 1)A2 (1.54 – 1)*4° = (1.72 – 1)*A2 0.54*4° = 0.72*A2 therefore, A2 = 2.16 / 0.72 = 3°.

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