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The index of refraction is defined as the speed of light in vacuum divided by the speed of light in a given medium. IOR = C/V, where V is the light speed specific for the different mediums.
| Material | Index |
| Vacuum | 1.00000 |
| Air at STP | 1.00029 |
| Ice | 1.31 |
| Water at 20 C | 1.33 |
| Acetone | 1.36 |
| Ethyl alcohol | 1.36 |
| Sugar solution(30%) | 1.38 |
| Fluorite | 1.433 |
| Fused quartz | 1.46 |
| Glycerin | 1.473 |
| Sugar solution (80%) | 1.49 |
| Typical crown glass | 1.52 |
| Crown glasses | 1.52-1.62 |
| Spectacle crown, C-1 | 1.523 |
| Sodium chloride | 1.54 |
| Polystyrene | 1.55-1.59 |
| Carbon disulfide | 1.63 |
| Flint glasses | 1.57-1.75 |
| Heavy flint glass | 1.65 |
| Extra dense flint, EDF-3 | 1.7200 |
| Methylene iodide | 1.74 |
| Sapphire | 1.77 |
| Heaviest flint glass | 1.89 |
| Diamond | 2.417 |
Indirect Illumination (GI) Anchor IndirectIllumination IndirectIllumination
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| IndirectIllumination |
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