What is refraction ?

What is refractive index ?

What is refractive Index ?

Define Snell's law. What is refractive index? Write its mathematical formula.

The polarising angle of a medium is 60^@ . What is refractive index of the medium?

If angle of incidence and angle of refraction be 45^@ and 30^@ respectively. What is refractive index of water is

What is refracted wave ?