4del 4991004 fight Gel 09 fufe affery la gio ac i Deduce expression for the equivalent focal length of two thin lenses in

Question

4del 4991004 fight Gel 09 fufe affery la gio ac i Deduce expression for the equivalent focal length of two thin lenses in contact and obtain an expression for the focal length of a combination of two coaxial thin lenses separated by some distance

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