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In YDSE, find the thickness of a glass s...

In YDSE, find the thickness of a glass slab `(mu=1.5)` which
should be placed in front of the upper slit `S_1` so that the central maximum now
lies at a point where 5th bright fringe was lying earlier (before inserting the
slab). Wavelength of light used is `5000 Å`.

Text Solution

Verified by Experts

According to the question
Shift `=5` (fringe width)
`:. ((mu-1)tD)/d=(5lambdaD)/d`
`:.` thickness of a glass slab
`t=(5lambda)/(mu-1)=(25000)/(1.5-1)=50000Å`
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