Question

The floor of a water tank appears at a depth of 2.5 m. If the refractive index of water is 1.33, find the actual depth of water.

Answer 1

\[\text{Refractive index} = \frac{\text{Real depth}}{\text{Apparent depth}}\]

Real depth = Refractive index × Apparent depth

= 1.33 × 2.5

= 3.325 m