Physics (optics) - Black Body Radiation

If you use a filter that transmits only between 1.95-2.05 um, what is the total power falling ona 1 cm^2 detector 1m away from a 1cm^2 1000K black body?

I know the formula for I and I think I need to integrate something, but I have no idea what formula to use for this problem.

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asked by Sam

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