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Find the two longest wavelength ("in" Å...

Find the two longest wavelength `("in" Å)` emitted when hydrogen atom make transition and the spectrum lines lie in the visible regain `(R = 1.097 xx 10^(7) m^(-1))`

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The correct Answer is:
A
Longest `lambda = `Shorted energy gap
In visible region , ` rarr 2 and 4 rarr 2 ` are the two longest wavelength
find `lambda_(3) rarr 2 = 6562.8 Å`
`lambda_(4) rarr 2 = 4861.3 Å`
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