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In a biprism experiment, the fringe widt...

In a biprism experiment, the fringe width is 0.4mm. The distance between the fourthh dark fringe and the sixth bright fringe is

A

0.5 mm

B

0.75 mm

C

1 mm

D

1.5 mm

Text Solution

Verified by Experts

The correct Answer is:
C
Distance of the sixth bright fringe from the centre=6X and the distance of the fourth dark
fringe `=(2n-1)(X)/(2)=(7X)/(2)=(3.5)X`
`therefore`Distance between the two fringes
`=(6-3.5)X=2.5xx0.4=1mm`
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