Answer :

Given, the thickness of the sheet, .

Wavelength of light,


refractive index,


Therefore the optical path difference,


If there was no film present, there is no path difference at the center. But due to the presence of the film, we have a path difference of .


Now for path difference of we have 1 fringe shift. Thus for a path difference of , we have


fringe shifts.


or,




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