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In a Young's double slit experiment, the...

In a Young's double slit experiment, the fringe width is found to be `0.4mm`. If the whole apparatus is immersed in water of refractive index `4//3` without disturbing the geometrical arrangement, the new fringe width will be

A

0.30 mm

B

0.40 mm

C

0.53 mm

D

450 micron

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