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 is . The central bright maximum will shift:
2 fringes upward
2 fringes downward
10 fringes upward
None of these
On introducing mica sheet, fringe shift
Where, $t$ is thickness of sheet.
So,
So, central bright maximum will shift 2 fringes upward.
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