Rozwiązanie:
[tex]\frac{1}{f} =(\frac{n_{s}}{n_{o}}-1)(\frac{1}{R_{1}}+\frac{1}{R_{2}})\\\frac{1}{f}=(\frac{n_{s}-n_{o}}{n_{o}}) (\frac{1}{R_{1}}+\frac{1}{R_{2}})\\\frac{1}{f} \cdot \frac{n_{o}}{n_{s}-n_{o}}=\frac{1}{R_{1}}+\frac{1}{R_{2}} \\\frac{n_{o}}{f(n_{s}-n_{o})} -\frac{1}{R_{2}} =\frac{1}{R_{1}} \\\frac{n_{o}R_{2}-f(n_{s}-n_{o})}{fR_{2}(n_{s}-n_{o})} =\frac{1}{R_{1}} \\R_{1}=\frac{fR_{2}(n_{s}-n_{o})}{n_{o}R_{2}-f(n_{s}-n_{o})}[/tex]
