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The Foldy-Lax (or the point-interaction) approximation of the electromagneticfields generated by a cluster of small scaled inhomogeneities is derived in themesoscale regime, i.e. when the minimum distance $\delta$ between the particlesis proportional to their maximum radi $a$ in the form $\delta=c_r \; a$ with apositive constant $c_r$ that we call the dilution parameter. We consider twotypes of families of inhomogeneities. In the first one, the small particles aremodeled by anisotropic electric permittivities and/or magnetic permeabilitieswith possibly complex values. In the second one, they are given as perfectlyconductive inclusions. In both the cases, we provide the dominating field (theso-called Foldy-Lax field) with explicit error estimates in terms of thedilution parameter $c_r$. In the case of perfectly conductive inclusions, theresults provided here improve sharply the ones derived recently in\cite{AB-SM:MMS2019}. Such approximations are key steps in different researchareas as imaging and material sciences.

Foldy-Lax approximation of the electromagnetic fields generated by  anisotropic inhomogeneities in the mesoscale regime with complements for the  perfectly conducting case