Final answer:
The correct action when seeing a visually impaired person with a white cane at a corner is to stop and let them pass safely.
Step-by-step explanation:
When observing a visually impaired person extending their white cane at a corner, the most appropriate action to take is to stop moving and remain stationary until the person has safely passed by. This respectful action ensures that the visually impaired individual has a clear and unobstructed path to navigate and can do so without interference. It is important to be mindful and patient, allowing the person to use their cane to safely assess their surroundings and make their way.