Materialmedium | Refractive index | Material medium | Refractiveindex |
Air | 1.0003 | Canada Balsam | 1.53 |
Ice | 1.31 | – | – |
Water | 1.33 | Rock salt | 1.54 |
Alcohol | 1.36 | – | – |
Kerosene | 1.44 | Carbon disulphide | 1.63 |
Fusedquartz | 1.46 | Denseflint glass | 1.65 |
Turpentine oil | 1.47 | Ruby | 1.71 |
Benzene | 1.50 | Sapphire | 1.77 |
Crownglass | 1.52 | Diamond | 2.42 |
Answer-
Air has the lowest optical density.
Diamond has the highest optical density.
The refractive index of a medium is directly proportional to its optical density. The optical density of a medium with the highest refractive index will be the highest, and vice versa.
The table shows that air and diamond have the lowest and highest refractive indexes, respectively. As a result, air has the lowest optical density while diamond has the highest.