Incident Radiation (Part 2)

In the xyzxyz-coordinate system, a thin solid square of side length SS lies in the xyxy-plane with its center at the origin. An isotropic light source is positioned at (x,y,z)=(0,0,S2)(x,y,z) = \left(0,0,\frac{S}{2}\right).

What percentage of the light energy is incident on the square ((to one decimal place; i.e., 6623%66\frac{2}{3}\% would be entered as 66.7)?)?

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