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Optical_Indicatrix_F10

Optical_Indicatrix_F10 - Optical Indicatrix GLY 4200 Fall...

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1 Optical Indicatrix GLY 4200 Fall, 2010
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2 Geometrical Representation The idea of a geometrical representation of the variance of the index of refraction goes back to Sir Lazarus Fletcher in The Optical Indicatrix and the Transmission of Light in Crystals (London, 1892) The geometrical representation is called an indicatrix
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3 Types of Indicatrix There are three general types of indicatrix These are Isotropic Uniaxial Biaxial
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4 Constructing the Indicatrix A vector, equal in magnitude to the index of refraction, can be assumed to originate at some origin The direction is arbitrary The heads of an infinite collection of such vectors, all pointing outward from the origin, would describe the geometrical figure called the indicatrix
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5 Isotropic Indicatrix The index of refraction is equal in all directions In the case of an isotropic substance, the indicatrix is a perfect sphere
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6 Dependence on Wavelength The magnitude of the vector, representing the index of refraction, will change depending on the wavelength of the light Thus, the size of the sphere will change, but the isotropic indicatrix remains a sphere
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