Answer to Question #151803 in Optics for A.A

Question

Slight variations variations in the actual path causes a_________ according to Fermat?

Answer 1

Slight variations in the actual path causes a second-order change in the traversal of time according to Fermat's principle which states that when a ray of light is travelling between any two points lets say point P and Q, the path that it will always use is the one that requires the least time.