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If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the A. luminous flux. B. illuminance of a surface.
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If we're interested in knowing the rate at which light energy is received by a unit of area on a particular surface, we're really trying to figure out the A. luminous flux. B. illuminance of a surface. C. luminous intensity. D. incandescence.

User Bhargav Mistri
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Illluminance is the measurement of photo-metric power. That means, illuminance is the rate of photo-metric flux that is received by a surface per area. It is usually expressed as a unit of W/m^2. Thus, from the choices, the answer we're looking for is illuminance.


User Siliarus
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