Given:
Total distance between front and back wall, \(d = 40.0 \, \text{cm}\)
Distance from fish to front wall, \(d_{\text{real}} = 20.0 \, \text{cm}\)
Refractive index of water, \(n_{\text{water}} = 1.333\)
Using the formula for apparent depth:
\[n =
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