The key difference between refraction and reflection is shown below.
Refraction occurs in when light enters a transparent material. Light slows down and changes direction - different wavelengths of light are affected by different amounts - shorter wavelengths are slowed more and their direction changes more.
The animation below shows this effect (file source http://en.wikipedia.org/wiki/File:Light_dispersion_conceptual.gif).
This effect tends to spread out the different wavelengths of light.
