[Borodog]

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This is essentially correct, barring the fact that you can't just use a "movie camera". After all, you can see the interference pattern while *looking* at the beam hitting the slits. You have to actually be able to *detect* which slit an individual photon passes through, which requires interacting with it, and localizing it, which is what destroys the interference pattern. But my understanding is that if you do as you say, that is, not observe the screen and wipe out the data of which slit each photon went through, and then observe the screen, you will observe an interference pattern.

Edit: Er, what gump said.


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So what you are saying is if light hits the particles they become localized and no interfence pattern is observed whether or not the light is observed?
I was under the impression that if light interacts with the particles, but the light is not observed, that an interfence pattern would be observed.

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Both are correct.