The ratio of the highest to the lowest wave length of Lyman series is=_______

$\frac{1}{\mathrm{\lambda }}={\mathrm{R}}_{\mathrm{H}}{\mathrm{z}}^2\left[\frac{1}{{\mathrm{n}}_1^2}-\frac{1}{{\mathrm{n}}_2^2}\right]$ for highest wave length energy of wave is lowest and for lowest wave length the energy of wave is maximum which is series limit line for lyman series.