Newton’s rings are formed by light reflected normally from a plano convex lens and a plane glass plate with liquid between them. The diameter of nth ring is 2.18 mm and that of (n+10)th ring is 4.51 mm. Calculate the RI of the liquid, given that the radius of curvature of the lens is 90 cm and wavelength of light is 5893 A° options 1.36 1.46 1.26 1.56

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