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Polarisation. Polarisation is when: Particle oscillations occur in only one of the directions perpendicular to the direction of wave propagation. Polarisation can only occur in transverse waves. This is because transverse waves oscillate in any plane perpendicular to the propagation direction. When transverse waves are polarised, this means:
This can be mathematically represented as (I = I_0 \cos^2θ), where (I_0) is the initial intensity of the light. Plane-Polarised Light and Unpolarised Light. Unpolarised light consists of waves with electric field vectors in random directions within a plane perpendicular to the direction of propagation. If unpolarised light passes through a ...
- Polarization by Use of A Polaroid Filter
- Polarization by Reflection
- Polarization by Refraction
- Polarization by Scattering
- Applications of Polarization
The most common method of polarization involves the use of a Polaroid filter. Polaroid filters are made of a special material that is capable of blocking one of the two planes of vibration of an electromagnetic wave. (Remember, the notion of two planes or directions of vibration is merely a simplification that helps us to visualize the wavelike nat...
Unpolarized light can also undergo polarization by reflection off of nonmetallic surfaces. The extent to which polarization occurs is dependent upon the angle at which the light approaches the surface and upon the material that the surface is made of. Metallic surfaces reflect light with a variety of vibrational directions; such reflected light is ...
Polarization can also occur by the refraction of light. Refraction occurs when a beam of light passes from one material into another material. At the surface of the two materials, the path of the beam changes its direction. The refracted beam acquires some degree of polarization. Most often, the polarization occurs in a plane perpendicular to the s...
Polarization also occurs when light is scattered while traveling through a medium. When light strikes the atoms of a material, it will often set the electrons of those atoms into vibration. The vibrating electrons then produce their own electromagnetic wave that is radiated outward in all directions. This newly generated wave strikes neighboring at...
Polarization has a wealth of other applications besides their use in glare-reducing sunglasses. In industry, Polaroid filters are used to perform stress analysis tests on transparent plastics. As light passes through a plastic, each color of visible light is polarized with its own orientation. If such a plastic is placed between two polarizing plat...
May 31, 2024 · Figure 2.6.3 – Polarized Light Through a Polaroid. Resolving the original electric field vector into components parallel and perpendicular to the polarizing axis, and keeping only the parallel part means that the new electric field vector magnitude is: E′o = Eo cos ϕ (2.6.1) (2.6.1) E o ′ = E o cos ϕ. The electric field vector is the ...
Feb 20, 2022 · 27.8: Polarization
Polarization - University of Tennessee ... Polarization
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When unpolarised waves are reflected from an dielectric material such as glass, the reflected waves become partially polarised. If a polaroid filter is used to view the reflected light, the intensity of the light will vary when the filter is rotated.
