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In Young's experiment if mica disc of th...

In Young's experiment if mica disc of thickness t and refractive index is placed in the path of one ray coming out of slit, fringes will move ...... distance on the screen

A

`(d)/(D)(mu-1)t`

B

`(D)/(d)(mu-t)`

C

`(d)/((mu-1)D)`

D

`(D)/(d)(mu-1)`t

Text Solution

Verified by Experts

The correct Answer is:
B
In Young.s experiment keeping a disc of refractiv index u and thickness t in the path of ra emerging from a slit is = `(n - 1)`.
But phase difference `=(xd)/(D)`
`:. (n-1)=t=(xd)/(D)`
`:.x()/(D)(n-1)t`
`:.` Frings will move distance `(D)/(d)(mu-1)t`.
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