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For this problem, I know the answer is B, but I do not know how to get there. Seeing the steps and equations would be much appreciated. Thank you

A person looks horizontally at the edge of a swimming pool. If its length is 5 m, and the pool is filled to the surface, to what depth (in m) could the observer see? (n for water is 1.33)
3.2
a.
b.
4.4
c.
2.1
d. 1.0
e.
0.3

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