Question

A coin placed at a depth of 16 cm in a water tub, appears at a depth of 12 cm. What is the refractive index of water?

Answer 1

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

\[ = \frac{16 \ \text{cm}}{12 \ \text{cm}} \]

\[ = \frac{4}{3} \]

≈ 1.33

Therefore, the refractive index of water is 1.33.