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In a biprism experiment , the distance b...

In a biprism experiment , the distance between the slit and the focal plane of the eyepiece is 1.2 m and the wavelength of light used is 5000 `overset (@)(A)` . When a convex lens is interposed (between the biprism and eyepiece) the images of the slits in the two positions are 5 mm and 1.8 mm apart . The distance between the centre of the pattern and twelfth dark band is

A

`1.3 xx 10^-3 m`

B

`2.2 xx 10^-3 m`

C

`3.3 xx 10^-3 m`

D

`2.3 xx 10^-3 m`

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