Find the illumination of table at point three ft from point
Problem
A point source unshaded electric lamp of luminous intensity of 100 candles is 4 ft. above the top of a table. Find the illumination of the table at a point 3 ft. from the point directly below the lamp.
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A point source unshaded electric lamp of luminous intensity. Find the illumination of the table at a point 3 ft. from the point directly below the lamp.
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