The graph only shows a calibration range for the sensor from 1–100 lux.Can you derive Equation 1 yourself using the graph? This will require knowledge of log-log plots.Equation 1 is derived from the graph on the photoresistor's datasheet.What is the mathematical relationship between resistance and distance? If you just glance at the graph, it might appear quadratic (resistance increases with distance squared), but is that actually the case? How does the resistance of the photoresistor change with distance? Make a plot of resistance versus distance.See the Variations section to learn more about the source of Equation 1. Convert the resistance values to illuminance in lux using Equation 1 (hold your mouse cursor over the equation to magnify it). Rotate the dial up one resistance setting (for example, from "200" to "2000") to increase the range. ", then the resistance has exceeded the range of the multimeter dial setting. If the screen of your multimeter reads "1.
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