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The Inverse Square Law of Light
 
First page of The Inverse Square Law of Light

The information in this document was accurate as of the original publication date.

Audience: Educators
Grades: 5-12


Students measure the relationship between distance and brightness of light. Once students discover the relationship, they can begin to understand how astronomers use this knowledge to determine the distances to stars and faraway galaxies.

By the end of this lesson, students will be able to do the following:
  • Demonstrate that the brightness of a source of light is a function of the inverse square of its distance.
  • Understand how the brightness of light can be used to measure distances, even to stars and faraway galaxies.

The Inverse Square Law of Light  [717KB PDF file]