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lecture 13 10107 - The Electric Vector in Light Waves...

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The Electric Vector in Light Waves Polarization of Light Waves square6 Each atom produces a wave with its own orientation of square6 All directions of the electric field vector are equally possible and lie in a plane perpendicular to the direction of propagation E r This is an unpolarized wave Polarized Light square6 A wave is said to be linearly polarized if the resultant electric field vibrates in the same direction at all times at a particular point square6 It may vibrate in any fixed direction Polarization can be obtained from an unpolarized beam by selective absorption reflection scattering Polarization by Selective Absorption square6 The most common technique for polarizing light square6 Uses a material that transmits waves whose electric field vectors in the plane are parallel to a certain direction and absorbs waves whose electric field vectors are perpendicular to that direction E. H. Land discovered a material that polarizes light through selective absorption He called the material Polaroid Polarization by Reflection square6 When an unpolarized light beam is reflected from a surface, the reflected light is square6 Completely polarized square6 Partially polarized square6 Unpolarized square6
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