Photometric law of distance - inverse square law

Article no. P2240267

Principle

The luminous intensity emitted by a punctual source is determined as a function of distance.

Benefits

  • Find out how exactly it becomes darker with increasing distance from a light source
  • Get results fast and reproducible with a data-logging system
  • Analize results easily and compare them to theory using a computer

Tasks

  1. The luminous intensity emitted by a punctual source is determined as a function of distance from the source.
  2. The photometric law of distance is verified by plotting illuminance as a function of the reciprocal value of the square of the distance.

Learning objectives

  • Luminous flux
  • Quantity of light
  • Luminous intensity
  • Illuminance
  • Luminance

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p2240267_en .pdf
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