When we see light (even when you look at a laser, ambient light and such) we are seeing the combination of the wave and the particle.
Not quite What you see is only the photon. The wave only exist when then photon moving from A to B. When the photon hits a receptor the wave collapses.
Watch this video on the Pilot Wave Theory which I think is the easiest explanation of the wave particle duplicity:
Or if you are a little braver try this one:
https://steemit.com/physics/@krischik/understanding-quantum-mechanics-incl-answers
Again, sort of, when you see an interference pattern, the light is the photon but the interference pattern is the wave. Light is complicated, and I dare say, we have much to learn about it still.
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Yes, The interference pattern shows how the photon travels. Once it hits the wall all the energy of the photon is released at one district point.
And it's even strange: The interference pattern will also appear when you fire whole atoms. Or molecules. They fired C60 (https://en.wikipedia.org/wiki/Fullerene) molecules and they showed the interference pattern pattern as well.
Light is not the only one who behaves that way.
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Basically as @puddles said, "Light is weird."
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