Seeing Under Water
Study Question
As you read this page, look for the information that answers this question:
How does the size and distance of objects under water differ from their appearance in air?
Video
Key Points
- To focus under water, our eyes need an air space in front of them, just as they do on land. This is why we wear dive masks.
- As light passes from the water, through the mask lens and into the air space inside, it bends — a process known as refraction. This creates a magnifying effect.
- Under water, objects appear 25 percent closer and one-third larger than they do on land.
- This helps explain why, when you reach out to touch something that appears to be within arm’s reach, you may find it just outside your grasp.
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