1.

What is the time taken (in seconds) to cross a glass of thickness 4 mm and \[\mu \]= 3 by light    [BHU 1998; Pb. PMT 1999, 2001; MH CET 2000; MP PET 2001]

A.            \[4\times {{10}^{-11}}\]  
B.            \[2\times {{10}^{-11}}\]
C.            \[16\times {{10}^{-11}}\]
D.            \[8\times {{10}^{-10}}\]
Answer» B.            \[2\times {{10}^{-11}}\]


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