ryanhinkle225 ryanhinkle225

19-10-2022
Mathematics

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The illumination I of a light source varies directly as the intensity i and inversely as the square of the distance d. If a light source with an intensity of 500 cp (candlepower) has an illumination of 20 fc (foot candles) at a distance of 15 feet, what is the illumination at a distance of 20 feet ?

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