October 26, 2012 18:30
According to a new study conducted by researchers from the University of Bristol, silvery scales of some fish species — in particular, herring, sardines and sprats — arranged in such a way as to reflect the incident light, not polarizing it, depending on the angle of incidence. Fishermen and photographers eliminate this effect by polarizing sunglasses or polarizing filters. Fish cover this feature endowed by nature. It helps them hide from predators, the official portal of the University of Bristol.
Previously it was thought that the fish scales, which contains a "stacked" layers of guanine crystals that have reflective properties, fully polarize the incident light, and as there is a drop of polarization reflectance scale. However, scientists have found out that covers the herring and sardines contain not one, but two types of crystals of guanine, each of which has different optical properties. With the combination of these two types of crystals scales does not polarize the reflected light and retains a high degree of reflectivity.
As stated in the classical laws of physics, the greater the angle of incidence, the greater must be polarized light. Fish have "proved" that it is not.