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![\frac{1}{f} = [n - 1 ][\frac{1}{(R)} - \frac{1}{r} ]](/tpl/images/1004/1692/154e0.png)
![\frac{1}{f} = [1.60 - 1 ][\frac{1}{( 0.0208 )} - \frac{1}{0.0248} ]](/tpl/images/1004/1692/35944.png)
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