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| Re: silly inverse square law question. |
Every point on the wall reflects light uniformly in all directions.
Ummm ... AI=AR
If a point on the wall is receiving light uniformly (i.e. diffuse light) from all directions, it will reflect light uniformly in all directions in accordance with AI=AR.
This is not the same as a point on the wall being a point light source that disperses light radially iaw ISL.
Light Science & Magic ... I'd recommend it over Wikipedia for a deeper read. Also, while the Wikipedia article introduces elements of translucent and refractive index properties of non-opaque objects, it does not come remotely close to presenting the issues fully. But, even here a thorough understanding of it will reveal that the substructure reflections still follow AI=AR (in conjunction with refractive index of translucent medium being passed through).