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Q.

Is it true that the lumen is the old unit of the luminosity of light?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
A lumen is a modern unit of the luminosity of light. The old unit of intensity of light is the foot-candle. The luminosity of light is the measure of radiated light.
The correct statement would be that the old unit of luminosity is candle power.
 
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