This Is A Cry For Help

The eternal physics grad student struggle captured in its purest form! Sleep becomes optional when you're trying to understand the subtle differences between interferometer calculations. For the uninitiated, a Michelson/Mach-Zehnder interferometer is used to measure tiny phase differences by splitting light beams and recombining them to create interference patterns. The homework solutions probably just say "trivial exercise left to reader" while our sleep-deprived hero is desperately trying to figure out why his calculations are giving him complex eigenvalues instead of power measurements. Behind him, that whiteboard with hexagonal structures (probably graphene or benzene rings) and equations is basically the inside of every physicist's brain at 4am. The academic version of "I've made a terrible mistake."