Question: If a 2 m times 2 m Lambertian surface receives 2 , 0 0 0 lumens and the surface has a reflectance of 5

If a

2

\

times

2

m Lambertian surface receives

2, 000

lumens and the surface has a reflectance of

50 %,

what is the exitance? What is the luminance? What is the luminous intensity in the direction of the surface normal? What is the luminous intensity at an angle of

45

degrees relative to the surface normal?

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