The magnifications produced by a convex ...

The magnifications produced by a convex lens for two different positions of an object are `m_(1)` and `m_(2)` respectively `(m_(1) gt m_(2))`. If 'd' is the distance of separation between the two positions of the object then the focal length of the lens is

`sqrt(m_(1)m_(2))`

`(d)/(sqrt(m_(1)-m_(2))`

`(d m_(1)m_(2))/(m_(1)-m_(2))`

`(d)/(m_(1)-m_(2))`

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