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 |
Related Questions
Light enters from air to glass, having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 x 108 ms-1.
Find out, from Table 9.3, the medium having the highest optical density. Also, find the medium with the lowest optical density.
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 The refractive index of diamond is 2.42. What is the meaning of this statement?
Define 1 dioptre of power of a lens.