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Two thin convex lenses of focal length f...

Two thin convex lenses of focal length `f_1` and `f_2` are kept in contact. The power of the combination is

A

`f_1+f_2`

B

`(f_1f_2)/(f_1+f_2)`

C

`(f_1+f_2)/(f_1f_2)`

D

`1/(f_1f_2)`.

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