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According to the Inverse-Square Law, if the distance to a lightbulb increases by a factor of 5, the bulb’s apparent brightness (flux)
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Step 1
According to inverse- square law
Where F = Flux (bulb’s apparent brightness), L is the luminosity, and r is the distance between source and the point where we want to find the flux
So when r is increases by 5 times, then flux will be
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