The Observer in Physics, Part 1: History and Background of the Measurement Problem
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How to Take a Beam Splitter Mirror Out of Half Silvered Mirrors
In this case, the observer is actually actively taking part in the experiment. It still has detectors, it still has beam splitter mirrors, half silvered. And as we move and we make the lenghs longer, you'll see an interference. Fringes come and go at the detectors. You lose past information because of the half silver mirrors. But if we take this half silver mirror out, so that path one goes to the detector on the top, and path two only goes to the detective on the side, then you will count photons. So once the single photon has come in, it's taken patha or path b, or who knows both, at the same time.
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