The refractive index of diamond is 2.47 and that of glass is 1.51. How much faster does light travel in glass than in diamond?
Solution:- Given The refractive index of diamond, μ = 2.47 ----------------------(1)
that of glass, μ' = 1.51 -----------------------(2)
As refractive index = c/v
c be the velocity of light in vacuum while v is the velocity of light in that medium
Taking the ratio:
μ/μ' = v'/v = 2.47/1.51 = 1.636
=> v' = 1.636 times v
ie velocity in glass medium = 1.636 times the velocity of the light in diamond