Find the speed of light of wavelength `lambda=600nm` (in air) in a medium of refractive index `5//3` and also wavelength of this light in medium.

Explanation

`mu = (c)/(v) rArr v = (c)/(mu) = (3 xx 10^(8))/((5)/(3)) = (9)/(5) xx 10^(s) = 1.8 xx 10^(8) m//sec`
`lambda = (lambda_(0))/(mu) = (600)/(5//3) = (1800)/(5) = 360 n m`