§V H§ asked:


I enclose 't even know where to begin for this problem: Two lamps have been a energy in candelas energy of 40 and 5 respectively and have been opposite 6 m. If a energy of illumination, I, during any indicate is without delay proportionate to a energy of a source and inversely proportionate to a block of a stretch from a source, find a darkest indicate on a line fasten a dual lamps.