Luminous flux
Luminous efficiency
Intensity of illumination
Luminous intensity
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Answer is Wrong!
The correct answer is: C. Intensity of illumination
Lux is the SI unit of illuminance, which is a measure of the light falling on a surface. It is defined as the luminous flux per unit area, and is measured in lumens per square meter (lm/m2).
Luminous flux is the total amount of visible light emitted by a source. It is measured in lumens (lm).
Luminous efficiency is a measure of how efficiently a light source converts electrical energy into visible light. It is defined as the luminous flux per unit of electrical power, and is measured in lumens per watt (lm/W).
Luminous intensity is a measure of the brightness of a light source in a particular direction. It is defined as the luminous flux per unit solid angle, and is measured in candelas (cd).