Refraction

Pretty many of you have faced with folded or even uncontinous drinking straw in the soda glass.



































Think about soldiers marching in rows from firm ground to muddy ground. They keep on walking in the same rhythm (frequency).

• How do change the length of the step and the speed? Analogue to wave motion!


• Snell law gives the change in the direction.

Try the explanation by Huygen's principle.