Question

define angle of minimum deviation​

Answer 1

Answer:

minimum angle of deviation. The smallest angle through which light is bent by an optical element or system. In a prism, the angle of deviation is a minimum if the incident and exiting rays form equal angles with the prism faces.

Answer 2

due to the peculiar shape of prism an emergent ray comes out in the Same direction as of incident ray the the common imaginary point at which they both meet makes an angle that angle is called angle of deviation