I was a tiny bit irritated by a throwaway reference in the text to the Mach-Zehnder Interferometer, where it was baldly stated that the quantum-theoretic interference effects were consistent with a classical (Maxwellian) interference story.
The OU diagram: Mach-Zehnder InterferometerHowever, the over-simplified diagram in the book (above) gave no clue as to the mechanism for classical interference. In reality, it depends upon the details of phase-changes on the two paths, associated with reflection and transmission through the half-silvered and regular mirrors: not entirely trivial, as explained here.
A more useful diagramNote that in this diagram we can see the construction of the mirrors, and whether light goes through the mirror-glass before getting reflected at the back-surface or not. Unfortunately, these details exactly determine the overall phase change: if they are ignored the resultant effect is incomprehensible.
Also started 2666, which I have to review as an Amazon Vine book. So far it's interesting, the characters are well-defined, and it's stylistically baroque. But still a long way to go.
We await the tidal wave of snow promised for tomorrow ...