[a]1. The problem statement, all variables and given/known data[/b] How does the distance from a point source of light affect the visibility of that light from the said source? 2. Relevant equations This is a bit tricky without sub points, but here goes: I1 x d12=I2 x d22 where: I=intensity d2=distance per sq. unit [c]3. The attempt at a solution[/b] By using the ISL formula above, I plan to find the intensity of light at predefined intervals (i.e. every 10 cm) by substituting variables in the equation. After which, I will use a voltmeter and CdS cell to verify my calculations. I'm pretty sure I'm doing everything right, but some suggestions would be nice.