You should layout your results like this example.
The inverse square law states that the intensity of the light from a point source diminishes inversely to the square of the distance. I=1/d² Here is a better illustration that what I drew on the white board.
Diagram of the 1st part of the assignment.I got this next chart from Lee Varis's website. He illustrates here the relationship of 18% grey to a modified 10 step zone system, 50% that you would see in Lightroom's histogram and the number 118 you see in Photoshop's histogram using RGB color space.
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