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If we're interested in knowing the rate at which light energy is recieved by a unit of area on a particular surface, we're really trying to figure out the

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Illluminance is the measurement of photometric power. That means, illuminance is the rate of photometric 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.

Explanation:

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 illuminance of a surface.

The illuminance of a surface describes the quantity of the light received at a surface or emitted by a light. It measures how much light illuminates the  unit of area on a particular surface.