A) \[60{}^\circ \]
B) \[180{}^\circ \]
C) \[90{}^\circ \]
D) \[30{}^\circ \]
Correct Answer: D
Solution :
\[\mu =\frac{{{v}_{raret}}}{{{v}_{denser}}}\] \[\mu =\frac{1}{\sin C}=\frac{2}{1}\] \[\sin C=\frac{1}{2}\] \[C=30{}^\circ \]
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