WHAT IS THE FERMAT'S LEAST TIME PRINCIPLE OR FERMAT'S PRINCIPLE?

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Robert · Accepted Answer

FERMAT’S PRINCIPLE OF LEAST TIME: 
In 1650, Fermat discovered a way to explain reflection and 
refraction as the consequence of one single principle.  It is called the 
principle of least time or Fermat's principle. 
Assume we want light to get from point A to point B, subject to 
some boundary condition.  For example, we want the light to 
bounce off a mirror or to pass through a piece of glass on its way 
from A to B.  Fermat's principle states that of all the possible paths 
the light might take, that satisfy those boundary conditions, light 
takes the path which requires the shortest time. 
(A more accurate statement of Fermat’s principle:

WHAT IS THE FERMAT'S LEAST TIME PRINCIPLE OR FERMAT'S PRINCIPLE?

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