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posted by Steve Tuesday, November 27, 2012 at 3:06am.
Light intensity(lumens) at a depth of x feet has the equation log I/12=-0.0125x what depth will the light intensity be half that of the surface
at x=0, I = 12 so solve log 6/12 = -x/8 log2 = x/8 x = 8log2
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