A) (Velocity of light in air\[=3\times {{10}^{8}}m\text{/}s\]) \[8\times {{10}^{-11}}s\]
B) \[2\times {{10}^{-11}}s\]
C) \[8\times {{10}^{-8}}s\]
D) \[2\times {{10}^{-8}}s\]
Correct Answer: B
Solution :
Time taken by light \[t=\frac{\mu d}{c}\] \[=\frac{1.5\times 4\times {{10}^{-3}}}{3\times {{10}^{8}}}=2\times {{10}^{-11}}s\]
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