1.

If the fringe with X =0.4 m m, the distance between 6^(th)bright band and the 4^(th)dark band on the same side is ?

Answer»

1 m m
0 . 5 m m
1 . 5 m m
2 . 5 m m

Solution :Distance of `6^(TH)`bright FRINGE,
`X_(6) = 6 (D lambda)/(d)`
Distance of `4^(th)`DARK fringe,
`X_(4) = (7)/(2) (Dlambda)/(d)`
`(D lambda)/(d) = 0 . 4` m m (GIVEN)
` :. X_(6) - X_(4) = (6 - (7)/(2)) (D lambda)/(d) = ` m m


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