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A thin sheet of glass (mu=1.520) is intr...

A thin sheet of glass `(mu=1.520)` is introduced normally in the path of one of the two interfering waves. The central bright fringe is observed to shift to position originally occupied by the fifth bright fringe. If `lambda=5890Å`. Find the thickness of the glass sheet.

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`x_(0)` = displacement of images =5w
`therefore D/d (mu-1)t = 5xx (lambda D)/d`
`t = (5lambda)/(mu-1) = (5xx5890xx10^(-8))/(1.52-1) = 5.66xx10^(-4)cm`
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