Question: A point source radiates (10 mathrm{~W} / mathrm{sr}) toward a (10 mathrm{~cm})-diameter lens. How much power is collected by the lens when its distance from
A point source radiates \(10 \mathrm{~W} / \mathrm{sr}\) toward a \(10 \mathrm{~cm}\)-diameter lens. How much power is collected by the lens when its distance from the source is
(a) \(3 \mathrm{~m}\) and
(b) \(100 \mathrm{~m}\) ?
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