The frequency of a light wave in a material is 2×1014 Hz and wavelength is 5000 Ao. the refractive index of material will be

Velocity of light waves in material isv=vλ               . . . .iRefractive  index  of   material  is   μ=cv   .  .  iiwhere  c  is  speed  of  light  in  vacuum  or  air.or  μ=cvλ     .   .   .  iiiGiven,   v=2×1014Hzλ=5000  Ao=5000×10−10m,c=3×108m/sHence,    from  Eq.  iii,   we  getμ=3×1082×1014×5000×10−10=3.00