A) \[8\times {{10}^{-11}}s\]
B) \[2\times {{10}^{-11}}s\]
C) \[3\times {{10}^{-11}}s\]
D) \[4\times {{10}^{-11}}s\]
Correct Answer: B
Solution :
[b] Velocity of light in glass \[=\frac{3\times {{10}^{8}}}{1.5}\] \[=2\times {{10}^{8}}\,m/\sec \] Time taken \[\frac{\text{distance}}{\text{velocity}}\] \[=\frac{4\times {{10}^{-3}}}{2\times {{10}^{8}}}=2\times {{10}^{-11}}\,\,\sec \]
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