333
Index of refraction of air, n_air = 1.000
Distance between front and back walls, d = 39.0 cm
Using the formula for apparent depth:
\[d' = \frac{n_{water}}{n_{air}} \times d\]
\[d' = \frac{1.333}{1.000} \times 39.0\]
\[d' = 1.333 \times 39.0\]
\[d' = 52.03 \,
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