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OpenStudy (anonymous):
The intensity of light at a distance r from a source is given by L = Ir^(−2), where I is the illumination at the source. Starting with the values I = 20, r = 20, suppose we increase the distance by 4 and the illumination by 4. By (approximately) how much does the intensity of light change? dL= ???
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OpenStudy (anonymous):
and its not - 0.0083
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