Question

2. Water is denser than kerosene.
3. A ball of iron floats in mercury.
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Answer 1

Answer:

The refractive indices of kerosene and water are 1.44 and 1.33 respectively. This means, kerosene is optically denser than water. Now, mass density of kerosene is 810 kg/m3 and that of water 998 kg/m3. It means, mass density of water is more than that of kerosene.

Thus, kerosene whose mass density is less than water, is optically denser than water.

A material floats if it possesses a lower density. Iron's density is 7.9 g/cm³ (grams per cubic centimeter). Mercury's density is 13.5 g/cm³. The iron presses on the mercury, but because it is lighter, it floats.

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