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In Young's Double Slit Experiment the ...

In Young's Double Slit Experiment the distance between the slits and the screen is `1.2 m` and the distance between the two slits is `2.4` mm. If a thin transparent mica sheet of thickness `1 mu m` and `R. I . 1.5` is introduced between one of the interfering beams , the shift in the position of central bright fringer is

A

0.25 mm

B

2 mm

C

0.5 mm

D

0.125mm

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