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Two thin lenses of focal lengths f(1) an...

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

A

`((f_1+ f_2))/(2) `

B

`(f_1f_2)/((f_1+f_2))`

C

`sqrt(f_1f_2)`

D

none of these

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The correct Answer is:
B
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