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Consider two spheres, S1 with radius R, S2 with radius r, R > r. The distance...

Consider two spheres, S1 with radius R, S2 with radius r, R > r. The distance between their centers is d > r + R. We will place an omnidirectional point source of light on the line joining the centers of S1 and S2 to illuminate both spheres. To make the illuminated surface largest, where should we place the point source? The light always travels in straight line.

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