Final answer:
The Visual Line of Sight Requirements (VLOS, CAR 901.11) pertain to aviation regulation, which is essential for maintaining sight of aerial vehicles to ensure safe operation. Design constraints are limitations set during development to ensure compliance with VLOS. The reference to light waves between points B and C might involve applying the Doppler effect in aircraft detection and monitoring.
Step-by-step explanation:
The Visual Line of Sight Requirements (VLOS, CAR 901.11) relate to the field of aviation regulation and engineering. This specification outlines the conditions necessary for a pilot or drone operator to maintain unobstructed, continuous visual contact with their aircraft. It is crucial for safely managing the aircraft's flight path in relation to other aircraft, people, and structures. The constraint mentioned refers to a design limitation that the team must work within when developing a new system or technology. In the context of VLOS, this could involve ensuring that the aircraft remains visible at all times during operation, without relying on external aids such as cameras or sensors. Observers between points B and C witnessing the lengthening of light waves are likely observing a physical phenomenon such as the Doppler effect, which may be relevant to the detection and monitoring of aircraft in VLOS.