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The vision in water and acoustic change
From;    Author:Stand originally

The light has refractive appearance into the meeting after water is medium, the object that brings about us to see in the place in water is 1.25 times bigger than real volume; Also can become close on the vision, distance of line of sight can shorten the 3/4 that is actual distance. And because sound underwater communicates speed to compare 4.2 times faster in air, when arriving, can be controlled almost ear hears at the same time, because of azimuth of audio of this very difficult resolution.