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     EduGorilla 
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    The illumination E, in foot candles, provided by a light source of intensity I, at a distance D, in feet, is given by E = I / D2. For an illumination of 50 candles at a distance of 4 feet from a source, the intensity of the source, in candles, must be

    Options :-

    1. 50
    2. 200
    3. 800
    4. 1,600
    5. 2,500
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