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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)?

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up vote 6 down vote accepted

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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Even the idea of there being such a thing as a photon is quantum too. – compman May 15 '12 at 22:35
@compman: Quantum ideas? :P – qubyte May 16 '12 at 6:09

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