We know that in electrodynamic when an incident Electromagnetic wave strikes a charged barrier it can either be reflected or transmits. And both of the incident, reflected and transmitted waves are in the same plane called plane of incidence. Now, i met a problem in which they state that the light is "polarized" perpendicular to the plane of incidence. I am trying to understand how it is not in the same plane as others but i can't. Am i wrong or something else. Please tell if you know more about it.