Define critical angle.

Find the angle of refraction in a medium (mu=2) if light is incident in vacuum, making an angle equal to twice the critical angle.

State the relation between the refractive index and the critical angle. Derive with suitable diagram.

As temperature of medium increases the critical angle

Define critical temperature.

Draw ray diagrams for incident rays at angle of incidence less than critical angle and more than critical angle?

The ralation between the polarising angle and the critical angle is

Define critical speed of a satellite. Derive an expression for it.

Total internal reflection and critical angle