A small light source located 1 m in front of an opening of area 1 m2 illuminates a wall
Chapter 0, Problem 2(choose chapter or problem)
A small light source located 1 m in front of an opening of area 1 m2 illuminates a wall behind. If the wall is 1 m behind the opening (2 m from the light source), the illuminated area covers 4 m2 . How many square meters will be illuminated if the wall is 5 m from the source? 4m' OF ILLUMINATION ~ 10 m from the source?
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