Stefan-Boltzmann Law: IvdvcosΘdw Explained

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Apashanka das
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I am having a doubt of why is the radiative flux IvdvcosΘdw in equilibrium integrated for a spherical black body only from 0 to pi/2 not pi(e.g. For the entire surface for which it is zero),
v=frequency
dw= solid angle
 

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