Refractive caustic network
by Konstantinos Kourtidis, Demokritus University of Thrace, Xanthi, Greece
This video shows the so-called refractive caustic network. A wavy water surface (the sea, in this image) projects patterns of sunlight onto nearby surfaces (the bottom, in this image). The surface of the water acts as a series of positive and negative lenses. The positive ones focus sunlight onto the bottom (creating the moving lines of light) while the negative ones refract light out of the beam.
Konstantinos Kourtidis (distributed via imaggeo.egu.eu)