Question

The refractive index of water is 1.33 at a certain temperature. When the temperature of water is increased by 40 °C, the refractive index changes to ‘x’.

State whether x < 1.33 or x > 1.33.

Answer 1

In general, a substance's refractive index falls as temperature increases. Therefore, increasing the temperature of water by 40°C is projected to reduce the refractive index 'x' to less than 1.33. Hence, we can state that x < 1.33.