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
0.11°
b
0.15°
c
0.22°
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∘