c) (10 points) If a ceiling lamp has a luminous intensity of 200 cd and its...

 

Transcribed Image Text:

c) (10 points) If a ceiling lamp has a luminous intensity of 200 cd and its distance above an office desk is 1.5 m. It provides direct lighting of the desk surface, which is medium gray and has a reflectance of 0.55. Determine the illuminance striking the desk surface and the luminance of the desk surface. c) (10 points) If a ceiling lamp has a luminous intensity of 200 cd and its distance above an office desk is 1.5 m. It provides direct lighting of the desk surface, which is medium gray and has a reflectance of 0.55. Determine the illuminance striking the desk surface and the luminance of the desk surface.