# Amplitude of a photon

## Main Question or Discussion Point

the amplitude of a photon gets divided when it goes through a double slit or through a mach-zender (http://en.wikipedia.org/wiki/Mach%E2%80%93Zehnder_interferometer

what is amplitude of a photon? is it simply related to probability or is it, in any way, to the EM fields?

what gets divided?..when a photon passes through the double slit

we know that the photon is the smallest quanta of energy and cannot be divided

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