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6mementomori ,

and I thought this had to do with light refraction lol

triclops6 ,

I mean, it kinda does?

Chrobin , (edited )

It does: Light does not follow the path of minimal distance between two points, but the path of minimal time. This is called Fermat’s principle.
Because water has a higher refraction index than air, light is slower in it and therefore takes a longer time to travel through it. Thus, it takes less time to take a longer path that spends more time in the air.
Fun fact: The underlying law of this principle is the principle of least action. This is the most basic law of nature we know of and can be used to derive all of physics.

Malfeasant ,

So… Nature is lazy?

6mementomori ,

I’d add to this that, if I’m not mistaken, it’s because light takes all possible paths and the average measured time is longer

crossover ,

The probably of the path it takes is the sum of all possible paths. Richard Feynman uses this exact swimmer in the water example during ok if his lectures.

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