The candela is the luminous intensity, in a given direction, of a source that emits monochromati....
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The candela is the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 'A' ×1012 hertz and that has a radiant intensity in that direction of 1B' watt per steradian. 'A' and 'B' are respectively
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