When a light ray travels between any two points,the path it takes is the one that (Hint: Eliminate answers you know are wrong. )
A)covers the greatest distance.
B)follows the greatest index of refraction.
C)avoids travel in more than one medium.
D)is the mean between the longest and the shortest paths.
E)takes the least time.

Question

Quizplus · Accepted Answer

This is the principle of Fermat's least time which states that light takes the path that requires the least time to travel between two given points. This principle is a consequence of the fact that the speed of light is dependent on the medium through which it travels, and it will take the path requiring the least time to arrive at the destination.

When a Light Ray Travels Between Any Two Points,the Path