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Two lamps are of intensities 40 and 5 candle power respectively and are 6m apart. If the intensity of illumination 'I', at any point is

Two lamps are of intensities 40 and 5 candle power respectively and are 6m apart. If the intensity of illumination 'I', at any point is directly proportional to the power of the source and inversely proportional to the square of the distance from the source, find the darkest point on the line joining the two lamps

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