Refraction
Snell’s Law: n1 sin(?1) = n2 sin(?2)
where n1 = c/v1 and v1 = [1/??]1/2
and ? = K?o where K = K(?) .
This means that n = n(?), and this means that ???-transmitted depends on the frequency.
Thus different colors will be bent slightly differently. This is called DISPERSION.