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It's because of total refraction. The light coming from the bottom of the pool cannot escape the separation surface if the angle is more than a specific value. More precisely sin(angle) > (n2/n1) where the angle is that between the perpendicular to the surface and the ray, n1 is the refraction index of water and n2 is the refraction index of air. I hope this is what you meant.
What else can I help you with?
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