the angle formed by a light ray that emerges from the second surface of a prism and a line parallel to the incident ray. Compare: angle of deviation.

Answer:

When a ray of light is incident on the surface of a glass prism, it undergoes refraction. ... When a ray of light suffers minimum deviation through prism, angle of incidence is equal to the angle of emergence. Ray of light passing through the prism will be parallel to the base of the prism.