Light scattering in matter. Main concepts and definitions

Light scattering in matter. Main concepts and definitions 

An ideally homogeneous medium does not scatter light on the average. Kvery local space element in such a medium ha.s another one in any direction, which provides the ray patli length difference of both the scattered waves to be equal to a halfwave length A/2, So, interference extinguishes both the scattered waves. 

light scattering, in principle, can be observed in an inhomogeneous medium only. Th( causes and character of heterogeneities may be various an ensemble of particles of one phase in another phase (colloidal, dispense, heterogeneous systems), density fluctuations in gases (vapours) and liquids, concentration fluctuations in multicomponent one-phase systems (solutions). 

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