Difference between revisions 425544491 and 436459308 on enwiki

'''Light scattering''' is a form of [[scattering]] in which [[light]] is the form of propagating energy which is scattered. Light scattering can be thought of as the deflection of a [[ray (optics)|ray]] from a straight path, for example by irregularities in the propagation [[optical medium|medium]], [[light scattering by particles|particles]], or in the interface between two media. Deviations from the [[law of reflection]] due to irregularities on a surface are also usually con(contracted; show full)

==Static and dynamic scattering==
A common dichotomy in light scattering terminology is [[static light scattering]] versus [[dynamic light scattering]]. The chief distinction is whether the scattering is observed to be changing over time (dynamic) or constant over the observation (static). This terminology is especially commonly encountered in the field of polymer chemistry, though it can obviously be applied to a broad range of situations.

==Critical phenomena==

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Density fluctuations are responsible for the phenomenon of [[critical opalescence]], which arises in the region of a continuous, or second-order, phase transition. The phenomenon is most commonly demonstrated in binary fluid mixtures, such as [[methanol]] and [[cyclohexane]]. As the critical point is approached the sizes of the gas and liquid region begin to fluctuate over increasingly large length scales. As the length scale of the density fluctuations approaches the wavelength of light, the light is scattered and causes the normally transparent fluid to appear cloudy.<ref>{{cite journal|author=Ostrowski, N. in Cummins, H.Z. and Pike, E.R., Eds.|title=Photon Correlation and Light Beating Spectroscopy|publisher=Plenum Press|isbn=0306357038|year=1973}}</ref><ref&(contracted; show full)
[[Category:Glass physics]]
[[Category:Scattering]]
[[Category:Scattering, absorption and radiative transfer (optics)]]

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