A Fresnel's biprism is used to form the ...

A Fresnel's biprism is used to form the interference fringes. The distance between the source and the biprism is 20 cms and that between the biprism and the screen is 80 cm. If `lambda=6563` Å and the separation between the virtual sources is 3.6 mm, then the fringe width is :

1.82 cm

0.182 cm

0.0182 cm

0.00182 cm

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