1.

A tank is filled with benzene to a height of 120 mm. The apparent depth of a needle lying at a bottom of the tank is measured by a microscope to be 80 mm.  The refractive index of benzene is                                       [Pb. PMT 1999]

A.            1.5
B.            2.5
C.            3.5 
D.            4.5
Answer» C.            3.5 


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