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Light generated by, say, a light bulb is a mixture of all the possible polarisations; we call such a light wave unpolarised.

What is polarisation of lightclass 12

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This document was written by David M. Harrison, Dept. of Physics, Univ. of Toronto, harrison@physics.utoronto.ca in February 2005. This is $Revision: 1.4 $, $Date: 2005/02/26 10:57:23 $ (y/m/d UTC).

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What is polarisation of lightexplain

In general, if the angles between the 2 filters is then the intensity of the light that emerges from the combination of filters is:

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What is polarisation of lightin physics

A moment's reflection will convince you that a transverse wave can have the plane of the oscillation at different orientations. The plane is called the polarisation of the wave. The following figures illustrate for the electric and magnetic fields of a light wave; the electric field is represented by the red arrows and the magnetic field by the blue arrows. The two polarisations are at right angles to each other.

Unpolarizedlight

Edwin Land, a Harvard dropout, invented the polaroid filters discussed in the previous section, in 1926. Before then the main way of producing a polarised beam of light was using a property of reflected light which is discussed in this section.

What ispolarizationofwaves in Physics

We have just seen that if the 2 filters are oriented at 90 degrees relative to each other, the second filter stops all of the light incident on it. Perhaps surprisingly, if we place a filter oriented at 45 degrees between these 2 polaroids, it turns out that some of the light emerges from the 90 degree polaroid.

If the angle of incidence of the beams is at a critical angle, called the Brewster angle, then all of the beam closest to you is reflected and all of the other beam is refracted into the glass. This is the situation that is shown.

Polarized and unpolarizedlight

Polarizationof lightnotes PDF

Similarly, if the first filter is oriented at 45 degrees and the second at 90 degrees, one-quarter of the incident beam emerges from the combination.

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Polarisationmeaning in Physics

At angles of incidence not equal to the Brewster angle, the reflected ray will still have more of the polarisation parallel to the surface of the glass than the perpendicular polarisation. Good sunglasses include polarisers in their lenses to filter out this polarisation. Thus the lenses tend to filter out reflected glare.

Polaroid filters are capable of selecting a particular polarisation state from an incident light wave. By convention the polarisation of a light wave is specified by the orientation of the electric field.

If the first filter is oriented at 0 degrees and the second filter is oriented at 45 degrees, one-half of the light incident on the second polaroid emerges. Thus one-half of one-half = one-quarter of the incident ray emerges from the combination of filters.

In the figure to the right, 2 beams of light are incident from behind and above onto a slab of glass. The polarisation of the beam closest to you, as given by the orientation of the shown electric field, is parallel to the surface of the glass. The polarisation of the other beam is perpendicular to this.

To the right we imagine an light wave incident from the left onto a polaroid filter. If the incident wave is unpolarised, then one-half of the wave will emerge from the polaroid filter.

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