50. The lamp hanging from the ceiling, giving the horiz

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50. The lamp hanging from the ceiling in the horizontal direction gives the light intensity I = 60 kd. What a luminous flux F falls on the painting area S = 0,5 m2, which hangs vertically on the wall at a distance r = 2 m from the lamp, if the opposite wall is a large mirror at a distance of a = 2 m from the lamp?

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)


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