Final answer:
Photoelectric sensors for garage door operators are usually located near the bottom of the door tracks, facing each other to create an invisible beam. When this beam is interrupted, it triggers the garage door opener to stop closing and reverse its direction.
Step-by-step explanation:
Photoelectric sensors are an important component of garage door operators. These sensors are typically placed near the bottom of the door tracks, facing each other. They create an invisible beam that, when interrupted, signals the garage door opener to stop closing and reverse its direction. This safety feature helps prevent accidents or damage to people or objects that may be in the path of the closing door.