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Two thin lenses of focal length f(1) and...

Two thin lenses of focal length `f_(1)` and `f_(2)` are in contact and coaxial. The power of the combination is

A

`f_(1)+f_(2)`

B

`(f_(1)F_(2))/(f_(1)+f_(2))`

C

`1/2(f_(1)+f_(2))`

D

`(f_(1)+f_(2))/(f_(1)F_(2))`

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