Draw i—D graph for prism, i = incident angle and D = angle of deviation.

A light ray is incident on one refraction face of a prism, of refractive angle A, at an angle of incidence, I and emerges from the opposite face, normally. If refractive index of the material of the prism be mu what will be the value of the angle of incidence?

If a ray of light passes through a prism symmetrically, calculate the angle of incidence and the angle of deviation. Angle of the prism = 80^(@) , mu = 1.5, sin40^(@) = 0.6428, sin 74^(@)37' = 0.9642 .

The refractive angle of a prism is 60^(@) . If the prism is immersed in a liquid then the minimum angle of deviation is 30^(@) . Critical angle of glass with respect to the liquid is

Establish the relation among deviation of a ray, angle of incidence and angle of refraction.

(i) State Brewster's law. (ii) An unpolarised light is incident at angle of polarisation on a reflector. Determine the angle between the reflected and the transmitted rays.