Question

Calculate the wavelength of the first and last line in the balmer series of h2 spectrum

Answer 1

I can't understand the H2.but accd.to Q for balmer series n1-2 and n2-3 1stcase.
So 1/lamda=Rh(1/4-19).wher Rh-1.09*10^7
And 2nd case
1/lambda=Rh(1/4-1/infinite).#wrere wavelength can be calculated.