What is need for Total Internal Reflection?

State 2 uses of Total Internal Reflection

What is the equation to identify the critical angle?

What happens at Total Internal Reflection?

What happens when you have a greater refractive index?

What is the critical angle?

Does Total Internal Reflection happen naturally?

Why do you sometimes get a weak reflection?

How are optical fibres used for medicinal purposes?

Calculate the critical angle from glass to water. (Water = 1.33, Glass = 1.5)

Why does a diamond sparkle?