A 50 cd lamp is suspended above the centre of a circular table of diameter 185 cm. When the lamp is lowered by 3 m, the illuminance at the centre of the table is four times what it was originally. (a) After the lamp has been lowered, determine the luminous energy that the lamp emits downwards in 7.25 minutes. (b) Determine the total radiant energy emitted per second. (c) Determine the original height of the lamp.
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