State the condition of total internal reflection. Calculate the speed of light in the medium whose critical angle of `45^@`.

Calculate the speed of light in a medium whose critical angle is 180^@ .

Write the conditions for total internal reflection to takeplace?

Define critical angle for total internal reflection.

What is the speed of light in a dense medium of polarising angle 30^@ ?

Explain total internal reflection. What are its conditions?

Total interval reflection takes place, when light travels from

State the condition of total internal reflectoin to take place at an interface separating two transparent media. Hence derive the expression for the critical angle in terms of speed of light in two media.