Is it true that the reflector sends the beam back to the transmitter and any change in position indicates misalignment?

The statement is true because a reflector in a measurement system, such as laser alignment tools commonly used in millwrighting, is designed to bounce the emitted beam back to the transmitter. This feedback mechanism is fundamental for alignment checks. If the beam is returned correctly and in the expected position, it indicates that the aligned components are correctly positioned relative to each other. Conversely, any deviation in the beam's return path showcases misalignment, prompting further adjustments. This functionality effectively helps in ensuring precise alignment of machinery and components, which is crucial in millwrighting to prevent equipment failure or operational inefficiencies.