Photon diffraction is a situation where photons travel through a material without being absorbed, but rather undergoing repeated scattering events which change the direction of their path.
Photon diffraction in autumn forest, Lake Karagöl near Ankara Airport. Diffraction refers to various phenomena which occur when a wave encounters an obstacle. A shadow of a solid object, using light from a compact source, shows small fringes near its edges consequence of the fact that light propagates as a wave.