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The frequency of a light ray is \[6\times {{10}^{14}}Hz.\]Its frequency when it propagates in a medium of refractive index 1.5, will be                                          [MP PMT 2000; DPMT 2003; Pb PMT 2003; MH CET 2004]

A.            \[1.67\times {{10}^{14}}Hz\] 
B.            \[9.10\times {{10}^{14}}Hz\]
C.            \[6\times {{10}^{14}}Hz\]       
D.            \[4\times {{10}^{14}}Hz\]
Answer» D.            \[4\times {{10}^{14}}Hz\]


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