Two lenses of focal legths f(1) and f(2)...

Two lenses of focal legths `f_(1) and f_(2)` are kept in contact coaxially. The resultant power of combination willl be

`sqrt((f_1)/(f_2))`

`sqrt((f_2)/(f_1))`

`(f_1+f_2)/2`

`(f_1+f_2)/(f_1f_2)`

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