GCSE Biology (AQA)

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Inverse Square Law & Light Intensity

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Bioenergetics Photosynthesis

Inverse Square Law & Light Intensity

1:51 Photosynthesis and Light Intensity, Carbon Dioxide and Chlorophyll
Spec 4.4.1.2
Previous Carbon Dioxide & Photosynthesis Next Chlorophyll Levels & Photosynthesis
  • As the distance between a plant and light increases, the light intensity decreases.
  • The relationship between light intensity and distance is inversely proportional, meaning as one factor increases, the other decreases.
  • Light intensity is inversely proportional to the square of the distance, not a linear relationship.
  • Linear relationships result in a straight line graph, either positive or negative.
  • The graph representing the relationship between distance and light intensity is non-linear, showing a decrease in light intensity as distance increases.
  • This relationship is known as the inverse square law and can be represented by an equation.
  • The equation states that light intensity is proportional to 1 divided by the distance squared.
  • Doubling the distance from the light source results in the light intensity falling to a quarter of its original value.
  • Understanding the inverse square law is important in the context of photosynthesis, though memorizing the equation or understanding the intricacies of the relationship is not necessary.
  • Key points to remember include the effect of doubling the distance on light intensity and the term "inverse square law."

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