Light Intensity Over Distance

by
Brian Foley Judy Stern
KIE Developer

A light probe can be used to measure the intensity of light coming from light sources. But what happens to the light intensity as you move the probe and the light source further apart? The interactive movie below summarizes an experiment which involved moving a flashlight back and forth away from a probe measuring its light intensity. Be sure to pay attention to how the graph changes!

To work the movie, move the flashlight icon, slide the red dot on the graph, or turn on animation. (It may take a moment to load.)