Q.

SI unit of luminous intensity is             .

A. lumen
B. lux
C. candela
D. watt
Answer» C. candela
Explanation: Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd).
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