Question

What is difference between angle of deviation and angle of emergence?

Answer 1

angle of emergence means the distance between the refracted ray and the imaginary ray but angle of deviation means the refracted Ray crosses the prism is called angle of deviation

Answer 2

And for the minimum angular deviation in a prism, the angle of incidence must be equal to the angle of emergence. Angle of incidence is the angle by which an incident ray makes with the normal where as angle of deviation is the angle by which the reflected ray is deviated from its original path.