Fermat’s principle

Fermat’s principle

1. Fermat’s Principle

2. Fermat’s Principle Before Fermat’s law: it is assumed that the light travels from one point to another point along the shortest path. In case of Reflection: Light propagate through the shortest path. In case of Refraction: Light does not follow the shortest path.

3. Fermat’s Principle Fermat's principle, also known as the principle of least time, is the link between ray optics and wave optics. In its original "strong" form, Fermat's principle states that the path taken by a ray between two given points is the path that can be traversed in the least time.