In the solution of the transport equation for scattering media it is usually assumed that the particles scatter independently, and that polarization effects may be neglected. The validity of these assumptions has been here tested by measurement of the bidirectional reflectance and transmittance of suspensions of monodisperse polystyrene spheres confined between two parallel glass slides, followed by comparison of the results with the values predicted from theory. For the range of conditions studied—particle diameters of 0.106 and 0.530μ, wavelengths of 0.436μ and 0.546μ, and optical thicknesses of 0.25–3000—the agreement between theory and experiment is excellent.

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