The Balmer Series: Page 3
There are three and maybe four vividly colored lines that you saw in the hydrogen lamp. The visible region of the Hydrogen spectrum was the first to be observed. Balmer found the visible lines of hydrogen could be correctly predicted as being transitions to the second energy state of the atom.
nf = 2
Using spectrum to the right see if you can anticipate the initial state (ni) corresponds to a wavenumber given below: