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

The correct option is A Angle of deviation goes on decreasing.

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.

Hence, the option $A$ is the correct answer.