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The divergence of a vector field which is the resultant of radial inverse-square law fields with respect to one or more sources is proportional to the strength of the local sources, and hence zero outside sources. Newton's law of universal gravitation follows an inverse-square law, as do the effects of electric, light, sound, and radiation ...
The Inverse-Square Law describes the predictable way a point light source radiates and changes in intensity with distance. As the distance from a source doubles, the area of the footprint of light increases by a factor of four, the square ^2 of the distance. [6]
Cases include nighttime and underwater photography, when a bright light source and reflective unfocused particles are near the camera. [1] Light appears much brighter very near the source due to the inverse-square law, which says light intensity is inversely proportional to the square of the distance from the source. [5]
The flash has given the foreground more illumination than the background. See Inverse-square law. Video demonstration of high-speed flash photography. A flash is a device used in photography that produces a brief burst of light (lasting around 1 ⁄ 200 of a second) at a color temperature of about 5500 K [1] [citation needed] to help illuminate ...
Calculating the relation between the apparent and actual luminosity of an object requires taking all of these factors into account. The object's actual luminosity is determined using the inverse-square law and the proportions of the object's apparent distance and luminosity distance.
Intensity (I) is inversely proportional to the square of the distance (D), as expressed by the formula I = 1 ⁄ D 2. For a point light source, with a tiny area, intensity is inversely proportional to distance. A softer light source is larger in area and so does not drop in intensity as quickly as a point light source does.
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Distance decay is graphically represented by a curving line that swoops concavely downward as distance along the x-axis increases. Distance decay can be mathematically represented as an inverse-square law by the expression