To compare properties of different waters we measured the reflectance of the second harmonic of Nd: YAG laser lightthrough different water samples in the laboratory. To generate realistic images of natural waters one must consider insome details the interaction of light with the water body. The diagrams have been utilized to represent effectiveparameters in the water’s reflectivity such as: the angle of incidence or the bottom conditions, height of the laser fromwater surface, wavelength of the laser light, radiant intensities, depth of water and also the impurities of water. Thereflectance of the bottom from a mirror at the bottom of an aquarium with different depths of water will depend on thebottom slope relative to the direction of incidence of the laser light and the coating to prevent damaging the mirroragainst the laser light so it is necessary to change the mirror after several experiments.