Final answer:
The imagery in the excerpt allows the reader to feel how lost Helen feels before she learns to communicate.
Step-by-step explanation:
The purpose of the imagery in the excerpt is to allow the reader to feel how lost Helen feels before she learns to communicate. The author uses the powerful metaphor of being at sea in a dense fog to convey the sense of being trapped and isolated, much like Helen was before her education began. The imagery helps the reader empathize with Helen's experience and understand the impact of her education.
Learn more about Imagery and its purpose in literature