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Given is the plane y = 0. A point light source is positioned at (1,10,1). The 
plane reflects only diffuse. The viewer is positioned at (4,6,4) and sees all 
points on the plane with 0 <= x <= 8 and 0 <= z <= 8. At which point on the 
plane does the viewer perceive the highest reflection?

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I think the answer is (1, 0, 1), the projection of the point light source onto the reflecting plane. Because a diffuse reflection scatters light equally in all directions so it doesn't matter where the reflection is relative to the viewer. All that matters is where the reflection is relative to the point light source, because the point light source shines a varying amount of intensity per unit area on different parts of the plane. But the highest concentration of intensity will be shined along the plane's normal vector aka the nearest point on the plane. Is this correct and if not how do you do this? Thank you