A) \[4\times {{10}^{-11}}\sec \]
B) \[8\times {{10}^{-10}}\sec \]
C) \[2\times {{10}^{-11}}\sec \]
D) \[1\times {{10}^{-11}}\sec \]
Correct Answer: A
Solution :
Thickness of glass\[s=4\,\,mm\] \[=4\times {{10}^{-3}}m\] Refractive index\[\mu =3\] The velocity of light in medium is \[{{v}_{m}}=\frac{velocity\,\,of\,\,length\,\,in\,\,vaccum}{refractive\,\,index}\] \[=\frac{3\times {{10}^{8}}}{3}={{10}^{8}}\,\,m/s\] Time taken to cross the glass \[\frac{s}{{{v}_{m}}}=\frac{4\times {{10}^{-3}}}{{{10}^{8}}}=4\times {{10}^{-11}}\sec \]
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