The transition n=6⟶n=3 corresponds to 6 lines in the spectrum. Spectral lines are in infrared region.
n=7⟶n=3 corresponds to 10 lines in the spectrum .
Spectral lines are in infrared region.
n=5⟶n=2 corresponds to 6 lines in the spectrum.
Spectral lines are in visible region.
n=6⟶n=2 corresponds to 10 lines in the spectrum.
Spectral lines are in visible region.
Note: The number of lines in transition n2→n1 will be (n2−n1)(n2−n1+1)2