Adjusting a photographer's lighting. The illumination from a light source is inversely proportional to the square of the distance from the light source. Ansel is taking a portrait with his light source set 4 feet from his subject and finds that the illumination is twice as bright as it should be. If he wants to reduce the illumination to one-half of what it is now, at what distance should he place the light?
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Adjusting a photographer's lighting. The illumination from a light source is inversely proportional to the square of the distance from the light source. Ansel is taking a portrait with his light source set 4 feet from his subject and finds that the illumination is twice as bright as it should be. If he wants to reduce the illumination to one-half of what it is now, at what distance should he place the light?
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