Refraction close refractionProcess by which a wave changes speed and sometimes direction upon entering a denser or less dense medium, eg a light ray ... o prisms. Total internal reflection occurs.

However, if the angle of incidence is greater than this critical angle, the ray undergoes total internal reflection and remains in the glass. In his classic book on optics Newton suggested that the ...

There are a variety of ray diagrams possible, depending on the position of the viewer and the amount of water in the beaker. Students could also investigate total internal reflection using ray ...