in-verse square law

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

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