inverse square law

noun Physics, Optics.
one of several laws relating two quantities such that one quantity varies inversely as the square of the other, as the law that the illumination produced on a screen by a point source varies inversely as the square of the distance of the screen from the source.
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World English Dictionary
inverse square law
 
n
any natural law in which the magnitude of a physical quantity varies inversely with the square of the distance from its source

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
First of all, the inverse square law will play havoc with trying to detect any
  radio signals.
Actually, they even out exactly, for both phenomena obey to a inverse square
  law.
Even with the inverse square law it's not too much difference in intensity.
Ignoring the difference, the inverse square law and all of physics.
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