A thin mica sheet of thickness and refractive index is introduced in the path of the light from upper slit. The wavelength of the wave used in . The central bright maximum will shift:
4 fringes upward
2 fringes downward
10 fringes upward
none of these
On introducing mica sheet, fringe shift
Where, t is thickness of sheet.
So, shift
So, central bright maximum will shift 4 fringes upward.
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