A) \[\frac{\sqrt{2}}{3}\]
B) \[\sqrt{\frac{3}{2}}\]
C) \[\sqrt{\frac{2}{3}}\]
D) \[\frac{1}{\sqrt{2}}\]
E) \[\frac{\sqrt{3}}{2}\]
Correct Answer: D
Solution :
\[\frac{\text{Width of incident wavefront}}{\text{Width of refracted wavefront}}=\frac{\cos i}{\cos r}\] \[=\frac{\cos 60{}^\circ }{\cos 45{}^\circ }=\frac{1/2}{1/\sqrt{2}}\] \[=\frac{1}{\sqrt{2}}\]
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