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According to the Inverse Square Law, at a distance of 10 feet from a flash, the area illuminated receives how much more/less light than the area illuminated at 20 feet from the flash?

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1. According to the Inverse Square Law, at a distance of 10 feet from a flash, the area illuminated receives how much more/less light than the area illuminated at 20 feet from the flash?





 
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