What has light got to do with glasses of water?

Year 6 had an investigative science lesson looking at refraction. We predicted, observed and drew conclusions from our investigation. We investigated the optical illusion of why a straw sometimes looks distorted when in a glass of water and what happens when you put an arrow behind a glass of water.

Try it yourself and see what happens! Why not ask Year 6 to share their knowledge of refraction and explain why these optical illusions happen?