In the spectrum of hydrogen atom, the ratio of the longest wavelength in Lyman series to the longest wavelength in the Balmer series is
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A
When an atom comes down from some higher energy level to the first energy level then emitted lines form of Lyman series.
where 
is Rydberg's constant.
When an atom comes from higher energy level to the second level, then Balmer series are obtained.
For maximum wavelength
Dividing Eq. (ii) by Eq. (i), we get
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