A double-slit arrangement gives fringes 0.20° apart for sodium light ($\lambda = 589$ nm). If the whole setup is immersed in water (n = 1.33), the angular fringe separation becomes approximately:
A0.20°
B0.15°
C0.27°
D0.30°
Answer & Solution
Correct answer: B. 0.15°
Wavelength becomes $\lambda/n$, so angular separation also becomes $1/n$ times: $0.20°/1.33 \approx 0.15°$.
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