Question: A planoconvex lens (flat on one side, convex on the other) with index of refraction n rests with its curved side (radius of curvature R)

A planoconvex lens (flat on one side, convex on the other) with index of refraction n rests with its curved side (radius of curvature R) on a flat glass surface of the same index of refraction with a film of index nfilm between them. The lens is illuminated from above by light of wavelength λ. Show that the dark Newton rings which appear have radii of r ≈ √mλ R/nfilm where m is an integer.

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