http://www.outdoorlanternsonsale.com/light-torch/
Why the torch light beam appears shorter when the torch is moving near to a fence and wider when it moves away?
When we move a torch to a wall the circle of light on the wall is shorter,,and it gets wider when the torch moves away.
the circle is formed as a result of the beam from the torchlight, since this beam is not strictly parallel (usually a bit divergent for torchlights), they have to grow wider when they travel longer distances, and so the bigger circles we observe when we move away from the wall.
if the beam was perfectly parallel, then we would observe circles of the same size no matter how far we get move from the fence.
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