Question

angle of incidence increases angle of deviation degrees but after a certain value of angle of incidence and angle of deviation included what is that specific value of angle of incident call does this angle simple light of all colours

Answer 1

Let me introduce you with the symbols first,
d = angle of deviation
i = angle of incidence
e = angle if emergence
A = angle of prism
u = refractive index of the prism's material
Now in general case,
d = i + e - A
but for minimum deviation, we have the condition as i = e, so it becomes,
d = 2i - A
Now if we've a very small angled prism, this goes as:
d = (u - 1)A [ where A is the small angle of the prism ]
Thank you.
Hope this helps. :)