1. The problem statement, all variables and given/known data Okay so this is a concept that I've been having a lot of problems with recently. I watched a few youtube vids to clear things up so now I'd like to make sure my notes are right. 1) For normal polarised light, the oscillations of a wave are in one plane only which include the direction of the energy transfer. 2) Whereas for polarisation by reflection, the oscillations are also in one plane but they are perpendicular to the direction of energy transfer. Are these two statements correct?