# Question #49b7a

Aug 30, 2017

Depends on the electromagnetic properties of the medium.

The wave velocity in the medium is given by,

$v = {\left(\mu \epsilon\right)}^{- \frac{1}{2}}$
Where $\mu$ and $\epsilon$ is respectively the magnetic permeability and electric permittivity of the medium.

Thus as the wave enters a new medium, the velocity changes.

From the relationship, $\nu l a m \mathrm{da} = v$ which holds for EM waves as well, on finds that $l a m \mathrm{da}$ which is the wavelength also changes accordingly.

It may be noted that frequency $\nu$ remains constant when the wave passes from one medium to another.