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In YSDE, both slits are covered by trans...

In YSDE, both slits are covered by transparent slab. Upper slit is covered by slab of R.I. 1.5 and thickness t and lower is
covered by R.I. `4/ 3` and thickness 2t, then central maxima
`

A

shifts in +ve y-axis direction

B

shifts in –ve y-axis direction

C

remains at same position

D

remains at same position
or downward depending upon wavelength of light

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