Question: An illuminant shaped as a plane horizontal disc of radius B = 25 cm is suspended over a table at a height h = 75

An illuminant shaped as a plane horizontal disc of radius B = 25 cm is suspended over a table at a height h = 75 cm. The illuminance of the table below the centre of the illuminant is equal to Eo = 70 lx. Assuming the source to obey Lambert's law, find its luminosity.

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