Que:
When light is vertically polarized what is it regarding the light that is vertical?
Ans:
It is the electric field somewhat than the magnetic field that gets most of the attention when one considers the interaction of light with matter for the reason that it is by far the electric field that interacts most strongly with matter.
Note that the react referring to the oscillation of charged particles is nonsense. Light doesn't consist of oscillating charged particles. It consists of electric as well as magnetic fields that oscillate and vary as a periodic function of position as well.