L33 - SUMMARY FROM LAST CLASS Optical properties of...

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Dr. P. Lucas U of A MSE 110 Optical properties of materials SUMMARY FROM LAST CLASS When light enters a solid, it can be partly reflected at the surface, transmitted through, absorbed or scattered. The reflectivity R represent the fraction of incident light reflected at the interface. It increases with the refractive index n: The refractive index represent the ability of the material to polarize under an oscillating electric field and how this interaction slows down the light wave propagating in a material: The refractive index of a material increases with density. In contrast with a glass or a monocrystal, a polycrystalline material appears opaque or translucent due to multiple internal reflection. The incident electromagnetic wave induces an oscillating electronic cloud which re-emits or scatters light in all directions. The light scattering efficiency increases for small wavelength and produces the blue color of the sky. 2 1 1 + = = n n I I R o R v c n = = ε o S I a I 4 λ =
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U of A MSE 110 Absorption OPTICAL PROPERTIES OF MATERIALS The absorbance is the fraction of light lost through absorption of photons by atoms in the material. A glass beer bottle absorbs some visible light and appears colored. I o I l α = e o I I The absorbance is a function of the path length through the sample and the absorption coefficient α of the material. A perfectly transparent material has zero absorption while a opaque
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This note was uploaded on 11/19/2009 for the course MSE 110 taught by Professor Lucas during the Spring '08 term at Arizona.

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L33 - SUMMARY FROM LAST CLASS Optical properties of...

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