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Q.

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

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a

0.22°

b

0.15°

c

0.11°

d

0.30°

answer is B.

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Detailed Solution

 Angular fringe width θ=λd⇒θ∝λ λw=λaμw  So θw=θair μw=0.2043=0.15∘

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