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Why light intensity falls with distance

Why light intensity falls with distance

Light from a point lamp spreading across detector screens at distances d, 2d, and 3d, with illuminated areas A, 4A, and 9A and intensities I, I/4, and I/9

The diagram shows how light from a point lamp spreads across larger areas as the distance increases. At distances ddd, 2d2d2d, and 3d3d3d, the illuminated areas are AAA, 4A4A4A, and 9A9A9A respectively.

6.1.3 Inverse square law and light intensity Lesson

  1. GCSE
  2. /Biology
  3. /6.1.3 Inverse square law and light intensity

Step-by-step lessons on Edexcel GCSE Biology 6.1.3 Inverse square law and light intensity. Each one builds up to exam-style questions. Start with the foundational topics and build up to the higher-tier material.

Lessons