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

In Young's double slit experiment, angular width of fringes is `0.20^@` for sodium light of wavelength `5890Å`. If complete system is dipped in water, then angular width of fringes becomes

A

`0.11^(@)`

B

`0.15^(@)`

C

`0.22^(@)`

D

`0.30^(@)`

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The correct Answer is:
B
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