1.

In double slit experiment, when a glass plate of mu = 1.5 ans thickness t is introduced in path of one of the interfering beams of wavelengths lambda, the intensity at position of central maxima remains unchanged. Minimum thickness of glass plate is :

Answer»

`2 lambda`
`(2lambda)/(3)`
`(lambda)/(3)`
`lambda`

Solution :For MAXIMA, the path `Deltax` due to slab must SATISFY following relation
`Deltax = (mu - 1) t = N lambda ,n = 1,2,3`.........
`t = (n lambda)/(mu -1)`
For minimum VALUE of t , n = 1
`therefore t = (1 lambda)/(1.5 -1) = (lambda)/(0.5) = 2 lambda`


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