A) \[2\times {{10}^{8}}\text{ }m{{s}^{-1}}\]
B) \[1.5\times {{10}^{8}}\text{ }m{{s}^{-1}}\]
C) \[3\times {{10}^{8}}\text{ }m{{s}^{-1}}\]
D) \[\sqrt{2}\times {{10}^{8}}\text{ }m{{s}^{-1}}\]
Correct Answer: B
Solution :
Refractive index, \[\mu =\frac{1}{\sin \,C}\] \[\mu =\frac{c}{v}\] \[\therefore \] \[\frac{c}{v}=\frac{1}{\sin \,\,C}\] \[\Rightarrow \] \[\frac{3\times {{10}^{8}}}{v}=\frac{1}{\sin \,{{30}^{o}}}\] \[v=1.5\times {{10}^{8}}m/s\]
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