Question

what is luminous intensity and its S.I. unit?

Answer 1

In photometry, 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 ofluminous intensity is the candela (cd), an SI base unit.

Answer 2

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Luminous intensity is defined as a measure of the wavelength weighted power that is emitted in unit time per unit solid angle.

Its SI unit is Candela ( cd).

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