A small surface of area A= 1 cm2 is subjected to incident radiation of constant intensity Ii = 2.2 × 104 W/m2·sr over the entire hemisphere. Determine the rate at which radiation energy is incident on the surface through (a) 0 ≤ θ ≤ 45° and (b) 45 ≤ θ ≤ 90°, where 8 is the angle a radiation beam makes with the normal of the surface.
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