The illumination at a point is inversely proportional to


The illumination at a point is inversely proportional to the square of the distance of the point from the light source and directly proportional to the intensity of the light source. If two light sources are 30 feet apart and their intensities are 70 and 50 respectively, at what point will the sum of their illumination be minimum?

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Physics: The illumination at a point is inversely proportional to
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