Saturday, July 16, 2011
How much does the intensity of light change?
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 = 90, r = 50, suppose we increase the distance by 3 and the illumination by 3. By (approximately) how much does the intensity of light change? dL=_?
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