is light from a light bulb polarized? Is light reflected from a plane mirror polarized? What about light reflected from a glass plate or shiny laboratory surface?
Light has to be filtered to be polarized. Some sunglasses are polarized. They have tiny slits that let only light which wavelengths travel with its axis parallel with the slits in the fliter. If you take two polarizing filters with slits 90 to each other this blocks almost all the light. to answer your question. None of the above light is polarized unless it has passed through a polarizing filter
