Wave optics describes light as propagating spherical waves rather than straight-line rays. Polarized light has its electric field oscillating in one direction, while unpolarized light has its electric field oscillating in random directions. Light can become polarized through processes like absorption, reflection, and scattering. Polarizers are used to transmit only the component of light polarized in a specific direction. Polarization has many applications including Polaroid sunglasses, microscopy, and liquid crystal displays which take advantage of polarization by molecules.