Sodium D lines | 590 nm and 589.6 nm |
Diamond | 2.42 | Perspex | 1.49 | |||
Sapphire | 1.78 | Glycerol | 1.47 | |||
Ruby | 1.76 | Paraffin | 1.43 | |||
Duodomethane | 1.74 | Magnesium fluoride | 1.38 | |||
Carbon disulphide | 1.63 | Water | 1.33 | |||
Glass (flint) | 1.53-1.96 | Ice | 1.31 | |||
Glass (crown) | 1.48-1.61 | Air at STP | 1.000 298 |
Average value for the Earth | 0.4 | Jupiter | 0.70 |
Mars | 0.17 | Moon | 0.073 |
Mercury | 0.07 | Venus | 0.72 | Fresh clean snow | 0.8 - 0.9 |