Polarization
Linear polarization Looking along the direction of the wave, the electric field is a single straight line. If the direction of the electric field remains constant, even if the size or magnitude is allowed to change, the state of polarization is referred to as linear. This is because the tip of the electric field vector traces out a straight line in the plane perpendicular to the forward direction of the wave. (Similar to shaking a jump rope up and down, looking at the rope from one end. The moving rope will make the shape of a line).