[Physics] Reflection during refraction


I have observed in a book that a light ray reflects during refraction, which is a partial reflection, but when does that occur? Is it related to the propagation of light from a greater to lesser refractive medium or from lesser to greater refractive medium?

Best Answer

Everything is about electromagnetic waves.

At the border of medium one of the components of electric field have to be continuus and other component of electric displacement field. Such calculations leads to Fresnel equations