Question

if angle of incident increases angle of deviation decreases but after a certain value of angle of incident, the angle of deviation increases what is the specific value of angle of incidence call does this angles same for light of colour

Answer 1

No, with deviation in wavelength of light,  angle also changes, since it is dependent on wavelength of light.

Hope this helps you.

Regards, Soham

Answer 2

Hey friend here is your answer.