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I was reading about MZ interferometers on Wikipedia

http://en.wikipedia.org/wiki/Mach-Zehnder

In the wiki article they have a picture of 4 samples of photon paths in a MZ interferometer. They indicate the probability of a finding a photon at detectors (A,B,C) for 3 of the diagrams but the fourth they leave you guessing. I am really bugged. I can't find the answer anywhere. What is the probability of detecting a photon at detector A in the bottom right diagram. I am thinking it must be 50%?

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# Mach-Zehnder Interferometer at Wiki Question

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