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At what distance apart should the poles for street lamps be placed so that the illumination on the ground at a point lying between two poles is not less than 4/15 lux? The height of the poles is 12 m. The power of the lamp is 300 candelas. In the calculations take into account only the two nearest street lamps.

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Answer: l = 55m.

Explanation:

The illumination from one street lamp at a distance of a = 1/2 from the pole is

 

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