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Can Someone explain Why we integrate over 4[tex]\pi[/tex]? What allows us to get rid of Omega?
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2 pi in 2D, not 3D.2pi = 360 which is enough.
No solid angle is the solid angle, like angle is angle in 2D. The 4π (steradians) solid angle is the 3D analog to 2π radians in 2D.solid angle is a volume?