Physics, Optics, Predestination, and Free Will

"When light goes through optical systems, it finds the path of least time, taking short cuts in glass and water, where light travels slower, and longer paths through air... "

It's a bit mystifying to know that light can do this unerringly. Because in order to do this, light already needs to know its ultimate destination before beginning its travel path. Any minor corrections along the way results in a path that does NOT take the path of least time. So the beam of light could be considered to be predestined to get to a particular destination.

However, it turns out it's not really a principle of "Least Time" given that light sometimes takes a path that takes longer than the most efficient path. Rather, it's a principle of extremes.

Is this a reflection of free will? We are destined for the same place, but we have a choice... the longer road or the faster road? Or are free will and predestination merely aspects of the same phenomenon... one that we cannot comprehend?

Or am I just stressing about nonsense?

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