At what distance L necessary to put the poles for stree

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Uploaded: 28.01.2017
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Description

At what distance L necessary to put the poles for street lights to the illumination surface of the earth at a point midway between the pillars was E = 0.5 lx? The height of the column h = 12 m. The strength of the beam I = 450 cd. Consider that a prominent lighting creates only two nearest lantern.

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Task 40932. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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