Chlead get the famed lloy yo go i fanfte affari Deduce expression for the equivalent focal length of two thin lenses in contact

Question

Chlead get the famed lloy yo go i fanfte affari Deduce expression for the equivalent focal length of two thin lenses in contact and obtain an expression fo the focal length of a combination of two coaxial thin lenses separated by some distance Caled stel dan PIATHT

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