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Well if you used the initial experiment to calculate the extinction coefficient(k) and then plug that back into the equation Id = I0 e^-kD (the extinction of Light in water)
Where Id is the intensity at the depth (D), Io Intensity at the surface (100), you get about 31% (depending on the number of places you plug into the equation. Which seems easier than all of the other methods.
Where Id is the intensity at the depth (D), Io Intensity at the surface (100), you get about 31% (depending on the number of places you plug into the equation. Which seems easier than all of the other methods.