Science
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 9.3.
| S. No. | Material Medium | Refractive Index |
|---|---|---|
| 1. | Air | 1.0003 |
| 2. | Ice | 1.31 |
| 3. | Water | 1.33 |
| 4. | Alcohol | 1.36 |
| 5. | Kerosene | 1.44 |
| 6. | Fused quartz | 1.46 |
| 7. | Turpentine oil | 1.47 |
| 8. | Benzene | 1.50 |
| 9. | Crown glass | 1.52 |
| 10. | Canada Balsam | 1.53 |
| 11. | Rock salt | 1.54 |
| 12. | Carbon disulphide | 1.63 |
| 13. | Dense flint glass | 1.65 |
| 14. | Ruby | 1.71 |
| 15. | Sapphire | 1.77 |
| 16. | Diamond | 2.42 |
Refraction Lens
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Answer
Light travels fastest in water as compared to kerosene & turpentine, because, refractive index of water is lower than that of kerosene and turpentine and speed of light is inversely proportional to the refractive index.
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No.Material Medium Refractive Index 1. Air 1.0003 2. Ice 1.31 3. Water 1.33 4. Alcohol 1.36 5. Kerosene 1.44 6. Fused quartz 1.46 7. Turpentine oil 1.47 8. Benzene 1.50 9. Crown glass 1.52 10. Canada Balsam 1.53 11. Rock salt 1.54 12. Carbon disulphide 1.63 13. Dense flint glass 1.65 14. Ruby 1.71 15. Sapphire 1.77 16. Diamond 2.42 The refractive index of diamond is 2.42. What is the meaning of this statement?
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