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Peter Gege said on Feb 19, 2013

While ß is an IOP in eq. (1), that is not true for eq. (2). The incident radiation is defined in eq. (1) by a collimated beam, but as irradiance in eq. (2). The beams forming E_i have different path lengths Delta_r in the medium, and the scattering angle Psi is different for each beam. Hence, the scattered intensity I_s depends not only on the magnitude of E_i, but on the directions and intensities of the beams forming E_i, i.e. eq. (2) describes an AOP. Consequently, optical properties derived from eq. (2) like b, bb and bf, are also AOPs.

Peter Gegesaidon Feb 19, 2013