This site gives you the formula for the Balmer series lines and shows the wavelengths for the first few lines. Note that the lines are decreasing in wavelength as the n2 level is increasing so if you plug 0 in for 1n22 you can calculate the shortest wavelength in the series..
http://astronomy.swin.edu.au/cosmos/B/Balmer+series
What is the shortest possible wavelength for a line in the Balmer series?
2 answers
Here it is calculated for you.
https://en.wikipedia.org/wiki/Balmer_series
https://en.wikipedia.org/wiki/Balmer_series
1 answer