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Candela is the unit of which?
Wavelength.
Luminous intensity.
Luminous flux.
Frequency.
Luminous intensity.
The candela (cd) is the SI base unit of luminous intensity in a given direction. It measures the power emitted by a light source in a particular direction per unit solid angle, weighted by the luminosity function which accounts for the human eye's sensitivity to various wavelengths.
The candela (cd) is the SI base unit of luminous intensity in a given direction. It measures the power emitted by a light source in a particular direction per unit solid angle, weighted by the luminosity function which accounts for the human eye's sensitivity to various wavelengths.
IvтАЛ=d╬йd╬жтАЛ тАФ Luminous intensity in terms of flux and solid angle
╬ж=4╧АIvтАЛ тАФ Total luminous flux for a uniform isotropic point source
Luminous intensity is defined as the flux per unit solid angle. Since the human eye perceives colors differently, the candela is strictly defined for monochromatic radiation at a frequency of 540├Ч10┬░12 Hz, where the radiant intensity is 1/683 watts per steradian. This allows for objective quantification of brightness as perceived by human vision.
Candela is one of the seven SI base units.
Luminous flux is measured in Lumens (lm).
Solid angle is measured in Steradians (sr).
One candela per steradian equals one lumen per steradian.
Standardized global measurement for lighting design
Accounts for human eye spectral sensitivity
Only applicable to visible light spectrum
Dependent on standardized spectral sensitivity curves
Photometry and lighting engineering
Specification of LED and lamp beam intensity
Display screen brightness calibration
Wavelength is measured in meters (m).
Frequency is measured in Hertz (Hz).
Luminous flux is the total quantity of light emitted in all directions, whereas intensity is directional.
B is correct тАФ The candela is the SI unit for measuring luminous intensity, representing the brightness of a source in a specific direction.
Always differentiate between 'Luminous Flux' (total light power, measured in Lumens) and 'Luminous Intensity' (directional light power, measured in Candela).