1.

The time taken by sunlight to cross a 5 mm thick glass plate \[(\mu =3/2\]) is       [MP PMT/PET 1998; BHU 2005]

A.            0.25\[\times \]10?10 \[s\] 
B.            \[0.167\times {{10}^{-7}}\]\[s\]
C.            \[2.5\times {{10}^{-10}}\]\[s\]                                         
D.            \[1.0\times {{10}^{-10}}\]\[s\]
Answer» B.            \[0.167\times {{10}^{-7}}\]\[s\]


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