Question

define the term 'angle of deviation' for a Ray of light incident on an equilateral prism of angle A. draw a graph showing the independence of the angle of deviation on the angle of incidence. use the relevant ray diagram to obtain a formula for the refractive index of the material of an equilateral prism in terms of the angle(<A) of the prism and angle(< §) of minimum deviation​

Answer 1

The peculiar shape of the prism makes the emergent ray bend at an angle to that of the incident ray called angle of deviations.