Two convex lenses of focal lengths f(1)a...

Two convex lenses of focal lengths `f_(1)andf_(2)` are separated co-axially by a distance d. The power of the combination will be zero if

`d = (_1 + f_2)`

`d = (f_1 - f_2)`

`d = sqrtf_1f_2`

`d = frac(f_1 - f_2)(2)`

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