Whats the difference between , intensity density, and just intensity ()?

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Whats the difference between , intensity density, and just intensity ()?

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is energy per time per area, related to the intensity functions we talked about before in the context of interference. The difference here is that is a differential distribution: it’s per wavelength interval, and gives you the wavelength dependence of the intensity (before we were just concerned with a single wavelength, or an intensity integrated over all wavelengths).

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