The classical physics developed by people such as Fraunhoffer and Fresnel seems to work very well(adsbygoogle = window.adsbygoogle || []).push({});

at predicting the results obtained when observing interference and diffraction patterns. Quantum theory seems to work well also and can be used,for example when photons are sent one at a time.

What I have been trying to find out is which, if any,of the two approaches (classical or quantum),is best at describing the observed results in a classical (eg not one photon at a time) set up? Are both approaches equally good at predicting all of the fine details that can be observed or does one approach work better than the other?

Thank you

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# Classical versus quantum interference.

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