Explain the relationship between medium density and wave propagation at the mediums interface?

Question

Can someone help me with this revision question before i do my exam?

I only need pretty basic answers no more than a paragraph.

Answer 1

The wave propagation at the mediums interface is governed by the index of refraction of the medium
The index of refraction usually increases as the physical density of the material increases. If you need more detail see
http://www.physlink.com/Education/AskExperts/ae337.cfm