Question

A small light source located 1 m in front of a 1 m^2 opening illuminates a wall behind. If the wall is 1 m behind the opening (2 m from the light source), the illuminated area covers 4 m^2. How many square meters will be illuminated if the wall is 3 m from the light source?

Answer 1

If it is 3m from the light source I think it will illuminate 9m^2. I know if it is 5m from the source it illuminates 25m^2 and also if it is 10m from the source it illuminates 100m^2 so it makes sense that 3m would illuminate 9m^2.