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What is the shortest wavelength present in the Paschen series of spectral lines?

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Rydberg’s formula is given as 

\(\frac{hc}{\lambda} = 21.76 \times 10^{-19}(\frac{1}{n_1^2}-\frac{1}{n_2^2})\)

h = 6.6 x 10-34 is the plank's constant.

c = 3 x 108 is speed of life.

The shortest wavelength present in the Paschen series of the spectral lines is given for values n1 = 3 and n2\(\infty\)

From the above values,

\(\lambda = 819nm\)

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