Solve for L
L=\frac{f_{1}h}{f_{1}+f_{2}}
f_{1}\neq -f_{2}
Solve for f_1
\left\{\begin{matrix}f_{1}=\frac{Lf_{2}}{h-L}\text{, }&f_{2}\neq 0\text{ and }h\neq 0\text{ and }L\neq h\\f_{1}\neq 0\text{, }&f_{2}=0\text{ and }h=L\text{ and }L\neq 0\\f_{1}\neq -f_{2}\text{, }&L=0\text{ and }h=0\end{matrix}\right.
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