Question

what happens to angle of deviation when a angle of incident ray is increased gradually in a prism​

Answer 1

Answer:

If you gradually increase the angle of incidence of a ray of light passing through prism then the angle of deviation goes on decreasing

Answer 2

Answer:

If you gradually increase the angle of incidence of a ray of light passing through prism then the angle of deviation goes on decreasing.

OR

If you gradually increase the angle of incidence of a ray of light passing through prism then the angle of deviation goes on decreasing because  in this process, you can notice the  variation of angle deviation with incidence angle when deviation angle is less than the angle of low deviation for the above given incidence angle then the deviation angle increases with the huge increase in incidence angle.