1.

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

Answer»

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

Solution :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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