All of the classic means of revealing refraction are employed in this interactive whiteboard presentation: a straw in a cup of water and light rays traveling through a piece of glass. On the drawing of light passing through glass, Derek diagrams the angle of incidence and the angle of refraction. Derek also shows that the bending of light depends on changes in the speed of light. All of the videos he has produced on light would be ideal to use in a flipped classroom situation, assigning them to physics learners for viewing at home.