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The central fringe of the interference p...

The central fringe of the interference pattern produced by the light of wavelength 6000 Å is found to shift to the position of 4th dark fringe after a glass sheet of refractive index 1.5 is introduced. The thickness of glass sheet would be

A

4.8 µm

B

8.23 µm

C

14.98 µm

D

3.78 µm

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