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Click Here For Best Selection Of High Quality Polarizing Microscope

Click Here For Best Selection Of High Quality Polarizing Microscope

Light that comes directly from the sun or from an incandescent bulb is called an ordinary light. The kind of light from this light sources vibrates in all directions at right angles to the direction of propagation and is known to be unpolarized. Polarized light on the other hand has constrained vibration direction so that it is not uniformly distributed around the direction of propagation. There are three different types of polarization that are related to each other. These are plane polarization, circular polarization, and elliptical polarization.

Plane polarization is also called linear polarization. In this type of polarization, the electric vector vibrates in a single plane. The light wave is actually a simple sine wave having vibration direction lying in the plane of polarization.

The light produced by two waves of plane polarized light with the same amplitude and whose vibration directions lie at right angles to each other is called circular polarization light. One wave is usually found retarded of about ¼ wavelength relative to the other. In order for the two vectors to produce a resultant vector at any point along the wave path, the two electric vectors can be added vectorially. The resultant vector is then found sweeping out a helical surface that looks like the threads on a screw. The outline of the helix is actually a circle when viewed along the direction of propagation.

On the other hand, the light produced in the same manner as circular polarized light except the two waves that produce it are retarded relative to each other by a value different than ¼ wavelength is called elliptical polarization light. The cross section of the resulting helix formation is now elliptical instead of being circular.



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Wednesday, February 27th, 2008 at 3:51 am
Category:
Optical Mineralogy
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Click Here For Best Selection Of High Quality Polarizing Microscope