A ray of light travelling in a transparant medium falls on a surface separating the medium from air at an angle of incidence of `45degree`. The ray undergoes total internal reflection. If n is the refractive in index of the medium with respect to air, select the possible value (s) of n from the following:
A. `mu=1.33`
B. `mu=1.40`
C. `mu=1.50`
D. `mu=1.25`
