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NOTE: this demo is gone, and this information here is strictly for historical purposes

Two light sources, one twice as strong as the other, are placed a meter apart. Two paraffin blocks with a sheet of aluminum foil sandwiched between them form a photometer; move the photometer between the light bulbs until the brightness on each half appears equal. One can extrapolate the inverse square law of luminosity.

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Relevant Simulation

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Other Information

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Real-Life Examples

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