  We experimentally investigate the depolarizing power and the polarization
entropy of a broad class of scattering optical media. By means of polarization
tomography, these quantities are derived from an effective Mueller matrix,
which is introduced through a formal description of the multi-mode detection
scheme we use, as recently proposed by Aiello and Woerdman
(arXiv:quant-ph/0407234). This proposal emphasized an intriguing universality
in the polarization aspects of classical as well as quantum light scattering;
in this contribution we demonstrate experimentally that this universality is
obeyed by a surprisingly wide class of depolarizing media. This, in turn,
provides the experimentalist with a useful characterization of the polarization
properties of any scattering media, as well as a universal criterion for the
validity of the measured data.
