by Alan Parker, Senior Scientist, Firmenich SA, Switzerland
The appearance of objects depends on the interaction of light and matter. So, the physics of light scattering is vital to understanding the connection between an object and the appearance of its image. I focus on the light backscattered from a tiny point of light hitting a flat object. How does physics constrain the amount of information that can be obtained, in principle? I concentrate on measuring the size (distribution) of spherical objects, like emulsions, but also discuss non-spherical objects and the use of polarized light.