1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Regarding Fermat's Principle

  1. Aug 15, 2014 #1
    According to Fermat's Principle (modified version) a light ray takes an extremum path. Can anyone explain the physical reason behind this? I mean, sure the light can take the least path but how can it take the longest path? And if it can indeed take the longest path, why not the paths shorter than longest? (Please, I don't want mathematical explanation. I am new here, if this is posted at wrong place or any other problem please PM me)
  2. jcsd
  3. Aug 15, 2014 #2


    User Avatar
    Gold Member

    People can tell many different things but they all boil down to this: That's the way it is!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook