The simple paper model discussed above is based on spherical voids embedded in a homogeneous host material. The optical constants of the host material have been shown above.

Two different size distributions of the spherical voids are considered. The first one is centered around 1 μm radius:

The voids do not absorb, of course, and have a more or less constant scattering coefficient, given by the red curve in the graph below for a volume fraction of 0.3:

The angle dependence of the average scattering event is - due to the quite large size of the voids - forward oriented:

Reducing the size of the spherical inclusions to this distribution

leads to larger scattering coefficients (for the same volume fraction)

and a broader angle distribution of the single scattering event: