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heisenbergs
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- Homework Statement
- A point luminaire with a luminous intensity of 2000 cd in all directions is 3 m away from the center of a plane
exists. In the middle of this distance, it has an annular cavity with an outer diameter of 3 m and an inner diameter of 2.4 m.
The plane has a parallel screen. Accordingly, the average illuminance level in the illuminated part of the plane
calculate.
- Relevant Equations
- Relevant Equations Luminous intensity [cd] = luminous flux [lm] / solid angle [sr].
Illuminance is calculated with the following formula: Lux [lx] = luminous flux [lm] / area [m2].
My solution attempt can be seen on these pictures.