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if we use a polariser then a wave lies to one of its axis which is parallel to transmission axis of polariser...ie.,in a light there is electric field and magnetic field which is perpendicular to each other,at instant if electric field is allowed to pass through polariser then component of magnetic field along transmission axis will be zero.... as we know light is having electric field and magnetic field within itself. If there is no magnetic field with electric field then how we can get a light after the polariser?