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**Homework Statement:**Propagation of Error for Focal Length

**Homework Equations:**f = (s'*s) / (s' + s)

In my lab, we had to calculate the focal length of a lens based on object distances (s) and image distances (s') that we measured. The object distances were measured with an uncertainty of Delta s = +/- 1mm and image distances were measured with an uncertainty of Delta s' = +/- 2.5 mm.

Since we had to add, multiply and divide values, I'm not quite sure what to do to propagate the error from those two values into the one for focal length.

Any help would be much appreciated.

Thank you.

**[Moderator's note: Moved here as it is of general interest and not a specific homework exercise.]**

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