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. incandescence. b. luminous flux. c. illuminance of a surface. d. luminous intensity.

C. illuminance of a surface.

a)  Incandescence:  The phenomenon of light emission by a body as a result of high temperature.

B. Luminous flux :  It is the quantity of the energy of the light emitted per second in all directions.

C. Illuminance of a surface :describes the quantity of light emitted by a light source or received at a surface.

D. luminous intensity : the quantity of visible light that a point source radiates in a given direction.

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c) both a and b.