Solution to task 501 from Chertov's for extramural stud

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• There is liquid between the glass plate and the plano-convex lens lying on it. Find the refractive index of the liquid if the radius r3 of the third dark Newton ring when observed in reflected light with a wavelength λ = 0.6 μm is 0.82 mm. The radius of curvature of the lens is R = 0.5 m.