This is due to the phenomenon of refraction of light. The rays of light coming from the bottom of the pool (or from the coil lying at the bottom of the can) travel from water to air. As the rays pass from denser (water) to rarer (air) medium they bend away from the normal. When the rays are produced back they form an image of the coil (bottom of the poor) are a point which is a little above the real position. Hence the coil appears to be slightly raised and the pool appears to be less deep than it really is.
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