![]() ![]() Where the distance is d(metres), the intensity of the radiation is I(candela). Mathematically, the formula can be written as, In short, as the distance increases the intensity of the light from the source decreases. The law states that the intensity of light from a given source varies inversely with the square of the distance of the source. The intensity of visible light is measured in candela units, while the intensity of other waves is measured in Watts per meter squared (W/m 2). The inverse square law of intensity is applicable to not only the visible rays in the electromagnetic spectrum but also to all the other spectrums like the gamma rays, X rays, UV rays etc. Similar concepts are also used in the gravitational law and the electric charge law of the Coulomb’s law. This is very evident from the fact that in the night when a car approaches us from a distance it looks dark but as it comes near the light the headlights make it be brighter as the distance between the observer and the car has decreased. Thus closer a light source brighter it is. This shows that as the distance from a light source increases, the intensity of light is equal to a value multiplied by 1/d 2. The intensity of the light to an observer from a source is inversely proportional to the square of the distance from the observer to the source. Let us learn more about Inverse Square Law Formula in detail. In physics many laws observe the inverse square rule, one such law is the one governing intensity. ![]()
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