Question

Is this angle of refraction or deviation ​

Answer 1

Hello!

Angle of refraction is the angle made by the refracted ray with the normal.

Angle of deviation is the angle made by the refracted ray with the original incident ray extended forwards.

So, the angle you have marked is undoubtedly the angle of deviation.

BRAINLIEST PLEASE!

Answer 2

It's easy Angle of deviation

Because:

The angle of deviation through a triangular prism is defined as the angle between the incident ray and the emerging ray (angle δ). It can be shown that when the angle of incidence i is equal to the angle of refraction r' for the emerging ray, the angle of deviation is at a minimum.