When an electric discharge is passed through the hydrogen gas filled in the discharge tube at low pressure, light radiations are emitted by hydrogen. When these light radiations are passed through the prism, a spectrum consisting of bright lines known as Atomic Spectrum of Hydrogen is obtained.

In

1/λ = R [ 1/n1

Where, R is called

In

**1884**,**observed that there were four prominent coloured lines in the visible region of hydrogen spectrum. This series of four lines in the visible region was named as the***J. J Balmer**. Later on, by careful observation four other spectral series were discovered in the infra-red and ultra-violet regions of hydrogen spectrum. These series were named after their discoverers. Thus,***Balmer Series****have five spectral series.***atomic spectrum of hydrogen*
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**in***Rydberg***1890**, gave a formula to calculate the wavelength of the various lines present in the particular series. The equation is as follows;1/λ = R [ 1/n1

^{2}- 1/ n2^{2}]Where, R is called

**and its value is***Rydberg constant***109,677cm**, n1 and n2 are whole numbers and for particular series n1 has particular value and n2 varies. E.g.^{-1}*For Lyman Series*, n1 = 1, & n2 = 2,3,4-----*For Balmer Series*, n1 = 2, & n2 = 3,4,5-----*For Paschen Series*, n1 = 3, & n2 = 4,5,6-----*For Brackett Series*, n1 = 4, & n2 = 5,6,7-----*For Brackett Series*, n1 = 5, & n2 = 6,7,8-----
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