A) \[10\times {{10}^{8}}\]
B) \[2\times {{10}^{8}}\]
C) \[3\times {{10}^{8}}\]
D) \[4\times {{10}^{8}}\]
Correct Answer: B
Solution :
Refractive index \[n=\frac{c}{\upsilon }\] \[\upsilon =\frac{c}{n}=\frac{3\times {{10}^{8}}}{1.5}=2\times {{10}^{8}}m/s\]
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