Refraction of Light According to General Covariance
October 1, 2018
In this paper I show how we can recover the standard law of refraction and reflexion of light as a consequence of an adaptation of Souriau’s general covariance principle. Switching from a variational principle to a principle of invariance, or more precisely covariance, under the group of diffeomorphisms, which is in some sense more satisfactory.

This is the first draft, feedback welcome....