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In Young's double slit experiment, the t...

In Young's double slit experiment, the two slits are covered by slabs of same thickness but refractive index `1.4` and `1.7` . The distance between slits and screen is 1 m and distance between slits is 1mm and wavelength of coherent source used is `4000 overset(@)Delta` and the central fringe shifts to the 3rd bright fringe positions, then

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