In Young's double slit experiment,two sl...

In Young's double slit experiment,two slits `S_(1)` and `S_(2)` are'`d`'distance apart and the separation from slits to screen is `D` (as shown in figure).Now if two transparent slabs of equal thickness `0.1mm` but refractive index `1.51` and `1.55` are introduced in the path of beam `(lambda=4000A^@)` from `S_(1)` and `S_(2)` respectively.The number of fringes

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