The modern unit of luminosity of light is

lumen

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watt

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watt hour

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candle power

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Solution

The correct option is A
lumen

Explanation for Correct option:
The modern unit of the luminosity of light is lumen.
Lumen is derived from candela.
Explanation for incorrect option:
Watt is a unit of power.
Watt-hour is a unit of energy.
Hence, the correct answer is option (A).

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