Question

Euler lagrange equation speed of light ray is proportional to its height above the base

Answer 1

contains a derivation of the Euler–Lagrange equation, which will be used ... seem over-complicated for such a basic problem, but far more complicated ..... wants to minimise its energy, which is proportional to its surface area. 17 ... (a, A), have the same height. ..... a ray of light is a stationary path of the time functional (26).