Question

what os angle of deviation​

Answer 1

Answer:

1. angle of deviation is that
2. see in photo

Answer 2

Angle of deviation is the angle formed between the incident ray produced forward and the emergent ray being produced backward.

Or

The angle of deviation is the angle between the direction of the refracted ray and the direction of the incident ray when a ray of light passes from one medium to another.

This angle shows how much the light is deviated from its initial path to that of the emerging path (while moving from one medium to another).