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

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

A

0.30 mm

B

0.40 mm

C

0.53 mm

D

0.2 mm

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