Can someone give me an example of a non polarized EM wave? I've heard that a light bulb would produces EM waves not polarized because the E fields of each waves aren't in the same direction. This I can understand. But in the case of a single EM wave, how do one gets a non polarized wave? I don't see how it's possible. What would that mean? That the E field's direction changes randomly when the time increases? How can we produce such a wave? But if the E field isn't continuous, it wouldn't satisfy Maxwell's equations? I'm confused.