Two thin lenses with focal length f1 and f2 respectively, are placed on the same principal axis so that they are in contact. (i) Derive an expression for the combined focal length of the system. (ii) What will be the magnification of the system

Two thin lenses with focal length f1 and f2 respectively, are placed on the same principal axis so that they are in contact. (i) Derive an expression for the combined focal length of the system. (ii) What will be the magnification of the system

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Two thin lenses with focal length f1 and f2 respectively, are placed on the same
principal axis so that they are in contact.
(i) Derive an expression for the combined focal length of the system.

(ii) What will be the magnification of the system?

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