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A fresnel biprism is used to form the in...

A fresnel biprism is used to form the inerference fringes. The distance between the source and the biprisim is 20 cm and that between the biprism and the screen is 80 cm. If A= 6563 A and the separation between the virtual sources is 3.6 mm, then the fringes width (in mm) is.

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The correct Answer is:
A
`beta= (lambdaD)/d = (6563 xx 10^(-10) xx 1m)/(3.6 xx 10^(-3))`
`beta = 0.0182 cm`
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