A plot of angle of deviation (D) versus angle of incidence (i) for a triangular prism isshown below. The angle of incidence for which the light ray travels parallel to the base is

A plot of angle of deviation (D) versus angle of incidence (i) for a t

1.	A plot of angle of deviation (D) versus angle of incidence (i) for a triangular prism isshown below. The angle of incidence for which the light ray travels parallel to the base is
Answer» `30^@` `60^@` `45^@` DATA in sufficient Answer :C