Physics for IGCSE & O level - Rays And Waves (Section 10 - No. 23)
What is the role of a medium in the total internal reflection process?
It changes the color of light.
It refracts the light.
The light travels faster
It must be more dense than the surrounding medium
Paliwanag
For total internal reflection, the light must be in a more dense medium compared to it's surrounding.