ABSTRACT

This chapter discusses chaotic scattering, diffusion, and provides some aspects of the interface between wave and geometric optics. It argues that the light-scattering dynamics in foams can present two main processes: a diffusive one related to Gaussian process and another one related to chaotic dynamics, similar to those observed in chaotic saddles, with some rays of light bouncing back and forth for a certain time, and leaving it through one of the several exits. The scattering process spreads the light and limits the depth of light penetration, creating a center glow located just the interface of the box and the foam. The parlaseric circle is a luminous ring generated by light scattering in foams or soap bubbles. The parlaseric circle is explained by the theory of geometrical diffraction. The pattern of the parlaseric circle presents some features of the geometrical optics, wave optics, and the theory of geometrical diffraction.