Light coming from the sun is unpolarised therefore the electromagnetic field is moving randomly along the direction of propagation . When light is polarised this means that the photons vibrate in one plane , but how can this happen ? it means that either one of the electric or magnetic fields must be cut out , is that right ? When light strikes a water surface then some rays will be polarized parallel to the surface but then if sunglasses were made of material that only lets light in vertically then we should see nothing ?!