Isothe CO 4 B Light containing two wavelengths A A falls normally on a Plano convex lens of radius of curvature R resting on a

Question

Isothe CO 4 B Light containing two wavelengths A A falls normally on a Plano convex lens of radius of curvature R resting on a glass plate If the nth dark ring due to coincides with the n 1 th dark ring due to Prove that the radius of nth dark ring due to is given by 7 MR 1474

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