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A double slit apparatus is immersed in a...

A double slit apparatus is immersed in a liquid of refractive index 1.33. It has slit separation of 1 mm and distance between the plane of slits and screen 1.33 m. The slits are lit by a parallel beam of light whose wave length in air is `6300 overset@A`. Calculate the fringe width.

A

0.73 mm

B

0.63 mm

C

1 mm

D

0.5 mm.

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