The goal of this work is to describe refraction of light on ruffled water surface and the intensity of light profile below it. The focus is on the area with increased intensity of light, that is the caustic. These areas are the most visible in wavy and unclear water. They can be observed due to the scattering of light on small, sandy particles present in the water. Light beams are intersected under water surface in several focal points, and by that the caustic network is formed. I described why is the caustic network phenomenon, how can we observe it and how the shape surface, at which the light refracts, affects the caustic network.
I analyzed various examples of complex surfaces and their impact on the starting position of the caustic and its splitting. I also tried to analyze the opposite, how the shape of water surface can be deduced from the caustic network