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 .

In a biprism experiment with sodium light,bands of width `0.0195cm` ar

1.	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 .
Answer» Correct Answer - `lambda=5850Å` `x_1=(n_1lambda_1D)/d` & `x_2=(n_2lambda_2D)/d` so, `x_2/x_1=(n_2lambda_2)/(n_1lambda_1)` `2.7/2=(30xxlambda_2)/(20xxlambda_1)` `lambda_2=0.9 lambda_1` `lambda_2=5400 Å`

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