(Solved) : Two Lenses Made Of Kinds Of Glass . . .

Two lenses made of kinds of glass having different refractive indices n1 and n2 are cemented together to form what is called an optical doublet. Optical doublets are often used to correct chromatic aberrations in optical devices. The first lens of a doublet has one flat side and one concave side of radius of curvature R. The second lens has two convex sides of radius of curvature R. Show that the doublet can be modeled as a single thin lens with a focal length described by

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