Physics - Geometrical Optics Question with Solution | TestHub

For total internal reflection to occur, two conditions must be satisfied:

1. The light ray must travel from an optically denser medium to an optically rarer medium.

2. The angle of incidence $i$ in the denser medium must be greater than the critical angle $i_c$ for the given pair of media, i.e., $i>i_c$.

Answer: light travels from denser to rarer medium and $\mathrm{i}>{\mathrm{i}}_{\mathrm{c}}$.