The discussion on this webpage mentions that shining a laser beam at a hair produces an effect like that of the double-slit experiment. Does classical physics predict the effect you observe when you do this (since light is a wave)?
1 Answer
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The fringe pattern of a double slit is entirely classical - it even works with ocean waves.
Why it still works with only one photon, and why it doesn't work if you look at the photon is quantum.
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$\begingroup$ Even the idea of there being such a thing as a photon is quantum too. $\endgroup$– compmanMay 15, 2012 at 22:35
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