JAMB Physics 2016 Paper

Concept:Refraction at the water surface makes objects appear shallower than their real depth. The refractive index relates apparent depth to actual depth.Explanation:The formula is $n = \frac{\text{actual depth}}{\text{apparent depth}}$, where $n = 1.33$.The apparent depth is $1.00\ \mathrm{m}$.So, actual depth = $n \times \text{apparent depth}$.Actual depth = $1.33 \times 1.00 = 1.33\ \mathrm{m}$.Therefore, the real depth of the pool is $1.330\ \mathrm{m}$.This corresponds directly to the value in option D.Answer:Actual depth = $1.330\ \mathrm{m}$ Correct option: D.