Refraction

When light passes from one medium to another, it goes through a few changes.  Understanding these changes is not only a key scientific skill, but essential for some fish and fishing.

Describe and explain the changes which occur for a ray of light passing into and then out of a glass block at an angle. You must address the following points:

·     What is the law of refraction?

·     Compare the speed of light in air to that in glass.

·     What significance does the density of the medium light is travelling in to the speed of light.

·     How  and why does the direction of light change when passing into a more/less dense medium with regards to the normal

You may find it useful to draw a diagram.