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Q.

Which of the following is the old unit of the luminosity of light?


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a

Lumen

b

Candlelight

c

Candle power

d

None of the above 

answer is A.

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Detailed Solution

Lumen is the old unit of the luminosity of light.
The virtue by which an object emits its own light is known as the luminosity of light. The old unit of the luminosity of light was candle power, and its present SI unit is Lumen. Also, one Lumen is equal to 12.56 candle power.
 
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Which of the following is the old unit of the luminosity of light?