68. Determine the height that should be on the drawing

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68. Determine the height that should be on the drawing board to hang a light bulb power P = 100 W, so that the illumination E of the board under the lamp was 50 lux. Tilt the board α = 30 °, the luminous efficiency light bulbs L is 10 lm / W. Lightbulb considered a point source, taking the total light flux F = 4πI (I - intensity of the light bulb).

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

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