Read the instructions below the simulation. You may adjust the index of refraction of each medium as well as changing the angle of incidence (angle in substance 2).
NOTE: In class we usually refer to where the light starts as medium 1 and where it ends up as medium 2. This demonstration reverses the order! Do not let this confuse you.
1. Can you get total internal reflection if n2 > n1?
2. Can you get total internal reflection if n1 > n2?