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How to turn dioptres into focal length?

Asked by Timebomb (240points) December 21st, 2009

I was under the impression to turn dioptres to the focal length I divide 1 by it. E.G. 3.3 dioptres equals ⅓.3=3.0303r.
I now is this also true with negative numbers E.G. -0.2 because it’s not working in my equations.

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