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In Young's double slit experiment, 5th d...

In Young's double slit experiment, `5th` dark fringe is obtained at a point. If a thin transparent film is placed in the path of one of waves, then 7th bright is obtained at the same point. The thickness of the film in terms of wavelength `lambda` and refractive index `mu` will be

A

`(1.5 lambda)/((mu - 1))`

B

`1.5 (mu - 1)lambda`

C

`2 . 5 (mu - 1) lambda`

D

`(2.5 lambda)/((mu - 1))`

Text Solution

Verified by Experts

The correct Answer is:
D
`x = (2 n - 1) (lambda D)/(2d)`
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