Take a look at the following picture:
Why does the light at the bottom of the water form this pattern? I have also seen the same phenomenon in all the swimming pools I've ever visited, of whatever depth they may be. How does this happen?
Answer
The pattern on the bottom of the pool it caused by the sides of ripples or waves on top of the water refracting the light of at large angles so they don’t reach the bottom but the peak of the wave refracts the light down so you get the concentrated light showing the formation of the waves on the bottom of the body of water. An OK metaphorical example of this would be how a magnify glass has a central focus point at the centre of the lens (the peak of the wave) and the outsides of the lens magnify light weaker and actually dulls the light (the sides of the wave). I hope this helps.
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