In a contaminated pool of water, the radiant flux density of light at a depth of 4 meters is 20% of that at the surface. How deep must one go to find a radiant flux density that is 2% that at the surface? Use the Beer-Lambert Law to answer to at least the nearest 0.01m.

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In a contaminated pool of water, the radiant flux density of light at a depth of 4 meters is 20% of that at the surface. How deep must one go to find a radiant flux density that is 2% that at the surface? Use the Beer-Lambert Law to answer to at least the nearest 0.01m.

 
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