You might expect that an opaque material will always hinder the transmission of light by absorbing or scattering any light that is shone on it. But by carefully preparing a beam of laser light, ...

A transparent substance will allow light to travel through on a straight line, in a turbid substance the light will be scattered numerous times, traveling on more complicated zig-zag trajectories. But ...

Light propagating in a layer of scattering nanoparticles, shows the principle of diffusion - like tea particles in hot water. The deeper light is penetrating into the layer, the lower the energy ...