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In a biprism experiment with sodium ligh...

In a biprism experiment with sodium light,bands of width `0.0195cm` are observed at`100cm` from slit.On introducing a convex lens `30cm` away from the silt between biprism and screen,two images of the slit are seen`0.7cm`apart of `100cm` distance from the slit .Calcualte the wavelength of sodium light .

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The correct Answer is:
`l = 5850 Å`
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