Question

what do you mean by angle of deviation?

Answer 1

The angle at which the emergent ray bend to the direction of the incident ray is known as the angle of deviation.

Answer 2

hey mate...

angle of deviation is the angle between the refracted ray and the incident ray is called angle of deviation.

OR

the angle equal to the difference between the angle of incidence and the angle of refraction of a ray of light passing through the surface between one medium and another of different refractive index.

hope this helped u..!