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Question
Name a liquid whose mass density is less than that of water but it is optically denser than water.
Solution
Kerosene has refractive index of 1.44, it’s mass density is less than that of water but it is optically denser than water (kerosene: 1.44 and water: 1.33).
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| Medium | Speed of light |
| Vacuum | 3.00 × 108 m/s |
| Flint glass | 1.86 × 108 m/s |
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| Group 'A' | Group 'B' | |
| Substance | Refractive index | |
| Air | (a) | 1.33 |
| (b) | 1.46 | |
| (c) | 1.0003 |
