Question

(i) What is the relation between critical angle and refractive index of a material ?

(ii) Does critical angle depend on the colour of light ? Explain

Answer 1

(i) Refractive index (μ) = 1/sin C

where C is the critical angle.

(ii) Since, refractive index depends upon the wavelength of light, the critical angle for a given pair of media is different for different wavelengths (colours) of light.