Light Intensity
What is the relationship between the light intensity and distance from a point source of light?
Try this
In a completely darkened room, create a light source by turning on the flash on one mobile device. Record the light intensity with another mobile device by using the Light Meter tool. Using a meter stick, measure how the light intensity changes as a function of distance from the light source.
Challenge yourself
- Create a graph of Light Intensity vs. Distance from the light source, and derive a mathematical expression for this relationship.
- If there are any constants in this mathematical expression, explain their significance.
- How would this experiment be different if the light source was bigger or brighter/dimmer? Explain.