A) \[{{15}^{o}}\]
B) \[{{30}^{o}}\]
C) \[{{45}^{o}}\]
D) \[{{60}^{o}}\]
Correct Answer: B
Solution :
\[\mu =\frac{c}{v}\Rightarrow \mu =\frac{c}{c/2}=2\] also for total internal reflection \[i>c\Rightarrow \sin i\ge \sin c\Rightarrow \sin i\ge \frac{1}{\mu }\] Hence \[i\ge {{\sin }^{-1}}\left( \frac{1}{\mu } \right)\] or \[i\ge {{30}^{o}}\]
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