Chapter 26 - Relativity - Learning Path Questions and Exercises - Exercises - Page 907: 26

2.4 m

Recall: $d'=\frac{d}{n}$ where d' is the apparent depth, d is the real depth and n is the index of refraction of water. Given: d=3.2 m and $n_{water}=1.33$ Substitute the values of d and n: Then we get $d'=\frac{3.2m}{1.33}=2.4 m$