Curved surfaces of a plano-convex lens of refractive index $μ_{1}$ and a plano-concave lens of refractive index $μ_{2}$ have equal radius of curvature as shown in figure. Find the ratio of radius of curvature to the focal length of the combined lenses

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1 f 1 = μ 1 - 1 1 R 1 f 2 = μ 2 - 1 1 - R ⇒ 1 f e q = 1 f 1 + 1 f 2 = μ 1 - 1 R - μ 2 - 1 R 1 f e q = μ 1 - μ 2 R ⇒ R f e q = μ 1 - μ 2

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