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In young's double slit experiment the sl...

In young's double slit experiment the slits are illumated by light of wavelength `5890^(@)` A and the distance between the fringes obtained on the screen is `0.2^(@)`. If the whole apparatus is immersed in water then the angular fringe width will be, if the refractive index of water is `4//3`

A

`0.30°`

B

` 0.15°`

C

` 15°`

D

`30°`

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