question_answer

A light wave has a frequency of \[4\times {{10}^{14}}\]Hz and a wavelength of \[5\times {{10}^{-7}}\] meters in a medium. The refractive index of the medium is                                                                    [MP PMT 1989]

A)            1.5 

B)            1.33

C)            1.0 

D)            0.66