A convex lens of focal length f(1) is ke...

A convex lens of focal length `f_(1)` is kept in contact with a concave lens of focal length `f_(2)`. Find the focal length of the combination.

`(f_1f_2)/(f_1 - f_2)`

`(f_1+f_2)/(f_1 f_2)`

`(f_1-f_2)/(f_1 f_2)`

`(f_1f_2)/(f_1 + f_2)`

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