A) \[1.5\times {{10}^{8}}m/s\]
B) \[2\times {{10}^{8}}m/s\]
C) \[3\times {{10}^{8}}m/s\]
D) \[5\times {{10}^{8}}m/s\]
Correct Answer: A
Solution :
Here : critical angle \[={{30}^{o}}\] From the law of total internal reflection, velocity of light in medium \[\frac{c}{\upsilon }=\frac{1}{\sin \,C}\] \[\upsilon =c\times \sin {{30}^{o}}=c\times 0.5\] \[=0.5\times 3\times {{10}^{8}}\] \[=1.5\times {{10}^{8}}m/s\]
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