Polarization is a property of transverse waves that are restricted in their directions of oscillation. It’s most frequently discussed in the context of electromagnetic radiation, including normal light, which can be polarized using a filter that only transmits light beams ‘waving’ in one plane.
Light consists of electric and magnetic fields oscillating perpendicular to each other, but the electric fields in ordinary light from the Sun or a torch oscillate in all possible planes. A linearly polarized light beam is one in which the electric field oscillations are restricted to one plane. It’s also possible to create circularly polarized light, in which the electric field oscillations continually rotate like the thread of a corkscrew as the light beam moves through space.
Light reflected from surfaces such as a flat road or smooth water tends to be horizontally polarized. Polarized sunglasses reduce reflected glare using filters that contain long-chain molecules. These preferentially absorb horizontally polarized light, so that only the vertical component passes through.

OPTICST polarizing beam splitter is made of a pair of high-precision right-angle prisms glued together. The slope of one of the prisms is coated with a multi-layer dielectric light-splitting film. When a beam of unpolarized light is incident perpendicular to the incident surface, it is divided into two beams of polarized light, which emerge from two adjacent surfaces perpendicular to each other, and the polarization states are perpendicular to each other. The transmitted light is P light, and the reflected light is S light.



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