Question

state the relation between the refractive index and the critical angle​

Answer 1

Explanation:

Explanation:The ratio of velocities of a light ray in the air to the given medium is a refractive index. Thus, the relation between the critical angle and refractive index can be established as the Critical angle is inversely proportional to the refractive index.

Answer 2

(i)As a result of the difference in the refractive index, the ray bends towards the surface. So the critical angle is defined as the angle of incidence that provides a 90-degree angle of refraction. Note that the critical angle is an angle of incidence value. For the water-air limit, the critical angle is 48.6 degrees.

(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.