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In the figure shown plane waves refracted from air to water using Huygen’s principle a,b,c,d,e are lengths on the diagram. The refractive index of water w.r.t air is the ratio:

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a/e

b/e

b/d

d/b

answer is C.

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Detailed Solution

$V_{m} t = d V_{a i r} t = b \frac{V_{a i r}}{V_{m}} = \frac{b}{d} = \frac{μ_{m}}{μ_{a}}$

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