Question

. If we gradually increase the angle of incidence of a ray of light passing through prism

then …..

a) Angle of deviation goes on decreasing.

b) Angle of deviation decreases but after certain value of incident angle, deviation

angle increases

c) Angle of deviation goes on increasing.

d) Angle of deviation increases but after certain value of incident angle deviation angle decreases.

Answer 1

b) angle of deviation decreases but after certain value of incident angle, deviation angle increases.

Answer 2

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

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.