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

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The Electric Vector in Light Waves Polarization of Light Waves s Each atom produces a wave with its own orientation of s 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 s 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 s It may vibrate in any fixed direction Polarization can be obtained from an unpolarized beam by selective absorption reflection scattering Polarization by Selective Absorption s The most common technique for polarizing light s 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 s When an unpolarized light beam is reflected from a surface, the reflected light is s Completely polarized s Partially polarized s Unpolarized s It depends on the angle of incidence
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lecture 13 10107 - The Electric Vector in Light Waves...

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