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| Re: silly inverse square law question. |
The parts of the reflected light spreading out in different directions don't matter all all. You / the camera / sensor only receive the rays which are directed towards you and this doesn't change with distance.
The rays that come in your "direction" spread out just like the rays that go from the light source to the subject. As you move your camera away the number of rays that fall on the lens surface decrease. This is just like what happens when you move a subject away from the light source. Light is light, it travels and acts the same way in both cases.