Question

Refractive index of water is 4÷3 then what is critical angle

Answer 1

By using 1/sinC formula and we will get 48.59°

Answer 2

It will depend on the refractive index of second medium.

We will need the refractive index of rarer medium also to calculate critical angle.

If it is air , then critical angle

c = sin^-1(1/4/3)

c=sin^-1(3/4)