The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness and refractive index is put in front of one of the slits , the central maximum gets shifted by a distance equal to fringewidths. If the wavelength of lightused is will be :
If sheet is placed infront of one slit ,
displacement of fring here
given,
Option 1)
Option 2)
Option 3)
Option 4)
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