We’ll leave the actual Physics out of this. Suffice to say students often see diagrams depicting Refraction and Total Internal Reflection, but seeing the real thing is fascinating. All you need to set this up is a solution of water and Dettol, and a laser light.
Great Indian origin Professor Verma had this to say about this experiment:
Invariably, all the teachers who have seen this experiment have broken into applause, and as they have told me, the reaction has been similar when they have performed this in their class in schools.
Experiment video:
