Light follows Fermat's principle by taking the path that minimizes travel time, which is evident in how rays converge at a focal point through a lens. The discussion raises the question of whether light can choose its path based on this principle, suggesting that if light rays took different times to reach a destination, they would interfere destructively due to phase differences. Conversely, if they take the same time, they constructively interfere, reinforcing the focal point. The conversation also speculates on how light "decides" its destination, questioning if it possesses any ability to think or choose. Ultimately, the dialogue explores the implications of Fermat's principle in understanding light's behavior.
