Refraction on water

Refraction is the bending of a wave caused by a change in its speed as it moves from one medium to another.
This occurs because of the slow speed of light in dense materials.

Examples of phenomena caused by refraction

  • When you place a bar in a cup with water, the bar looks bent.
  • If you dip your feet in the water, it looks shorter than the original.
  • The fish looks smaller when you take it out of the water.