Imagine you’re in a completely dark room with no windows and you cut a 1@ft2 round hole in the roof. When the Sun is high in the sky, about 100 W of solar power enters the hole. On the floor where the light hits, you place a beach ball covered with aluminum foil, with the shiny side out. Discuss the illumination in your room compared with that of a 100-W incandescent lightbulb?
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