Question

when light travels from an optically denser medium to rarer medium why does the critical angle incidence depend on the colour of light.

Answer 1

it bends towards the normal ..

Answer 2

Hey !!

The refractive index is for different colour wavelength as μ = a + b / λ². Hence, critical angle sin ic = 1 / μ would also be different for different colour of light.

Good luck !!