The intensity of a light varies inversely as the square of the distance from the light source. If the intensity from a light source 3 feet away is 8 lumens, what is the intensity at a distance of 2 feet?
Light intensity at 2 feet is 8 lumens
Let intensity be
Let the distance from light source be
Let the constant of association be
Multiply both sides by
So at 2 feet we have: