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A single lamp placed centrally at the roof provides 40 lux...

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Mine Environment
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A single lamp placed centrally at the roof provides 40 lux illumination vertically below, at the floor of an underground workshop. The workshop of dimensions 20 m × 20 m with height 4m. Assuming uniform spherical dispersion of luminous intensity, the floor level illumination in lux at any corner of the workshop is

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Correct Answer: Option D
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