For the Balmer series, in the spectrum of H atom , - v = R _ H \ 1...

For the Balmer series, in the spectrum of $H$ atom, $\overset{-}{v} = {R}_{H}\left\{1{n}_{1}^{2} - 1{n}_{2}^{2}\right\},$ the correct statements among \left(I\right) to \left(IV\right)$are,<br />\left(I\right)$ As wavelength decreases, the lines in the series converge.
\left(II\right)$The integer${n}_{1}$is equal to$2$/<br />\left(III\right)$ The lines of the longest wavelength correspond to ${n}_{2} = 3$.
\left(IV\right)$ The ionization energy of hydrogen can be calculated from the wave number of these lines.