| When a Ray of light is refracted by a Prism such that the angle of deviation is minimum, then |
| (a)The angle of emergence is greater than angle of incidence |
(b)The angle of emergence is equal to angle of incidence  |
| (c)The angle of emergence is smaller than angle of incidence |
| (d)The sum of angle of incidence and the angle of emergence is equal to 90 degree. |
