A) 30°
B) 45°
C) 60°
D) 90°
Correct Answer: D
Solution :
\[v=\frac{\sin i}{\sin r}=\frac{{{v}_{1}}}{{{v}_{2}}}\] Þ\[\sin r=\sin 30{}^\circ \times \frac{2u}{u}\Rightarrow \sin r=\frac{1}{2}\times 2\times 1\]\[\Rightarrow r=90{}^\circ \]
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