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The document discusses the inverse square law as it relates to light intensity and distance from the light source. It explains that as the distance from the light source increases, the light spreads over a larger area resulting in lower intensity according to the inverse square law. It provides examples of how light intensity from a flashlight or photo flash decreases with distance. It also discusses implications for crime scene and other photography, noting the importance of distance between the light source and subject to avoid overwhelmed images.
