1.

In Young.s duble slitexperiment ,when a glass plate (mu=1.5)of thickness is introduce path of one of the interfering beams (wavelength =lambda) ,the intensity at the position where centre maxima occurred previous remains unchanged .The minimum thickness at the gives

Answer»

`2 LAMBDA `
`lambda `
`2/3 lambda`
`lambda/3`

ANSWER :A


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