Marine life is dependent upon the microscopic plant life that exists in the photic zone, a zone that goes to a depth where about 1 % of the surface light remains. In some waters with a great deal of sediment, the photic zone may go down only 15 or 20 feet. In some murky harbors, the intensity of light d feet below the surface is given by I l e 0.26d, where lo is the intensity of light at the surface. What percentage of the surface light will reach a depth of (A) 10 feet? (B) 20 feet?

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