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Two thin convex lenses of focal lengths ...

Two thin convex lenses of focal lengths `f_1` and `f_2` are placed at a distance `d` between them. For the power of combination to be zero, the separation `d` should fee :

A

`f_1-f_2`

B

`f_1+f_2`

C

`sqrt(f_1f_2)`

D

`sqrt(f_1^2+f_2^2)`.

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