user
Instruction
Answer the question based on the provided table.


Table
Table Title: List of refractive indices
Table Content:
| Material | λ (nm) | n |
| --- | --- | --- |
| Vacuum |  | 1 (by definition) |
| Air at STP |  | 1.000277 |
| Air | 589.29 | 1.000293 |
| Carbon dioxide | 589.29 | 1.00045 |
| Helium | 589.29 | 1.000036 |
| Hydrogen | 589.29 | 1.000132 |
| Arsenic trisulfide and sulfur in methylene iodide |  | 1.9 |
| Benzene | 589.29 | 1.501 |
| Carbon disulfide | 589.29 | 1.628 |
| Carbon tetrachloride | 589.29 | 1.461 |
| Ethyl alcohol (ethanol) | 589.29 | 1.361 |
| Silicone oil |  | 1.336-1.582 |
| Water | 589.29 | 1.3330 |
| 10% Glucose solution in water | 589.29 | 1.3477 |
| 20% Glucose solution in water | 589.29 | 1.3635 |
| 60% Glucose solution in water | 589.29 | 1.4394 |
| Titanium dioxide (Rutile phase ) | 589.29 | 2.496 |
| Diamond | 589.29 | 2.419 |
| Strontium titanate | 589.29 | 2.41 |
| Amber | 589.29 | 1.55 |
| Fused silica (also called Fused Quartz) | 589.29 | 1.458 |
| Sodium chloride | 589.29 | 1.544 |
| Liquid helium |  | 1.025 |
| Water ice |  | 1.31 |
| Cornea (human) |  | 1.373/1.380/1.401 |
| Lens (human) |  | 1.386 - 1.406 |
| Acetone |  | 1.36 |
| Ethanol |  | 1.36 |
| Glycerol |  | 1.4729 |
| Bromine |  | 1.661 |
| Teflon AF |  | 1.315 |
| Teflon |  | 1.35 - 1.38 |
| Cytop |  | 1.34 |
| Sylgard 184 (Polydimethylsiloxane) |  | 1.4118 |
| PLA |  | 1.46 |
| Acrylic glass |  | 1.490 - 1.492 |
| Polycarbonate |  | 1.584 - 1.586 |
| PMMA |  | 1.4893 - 1.4899 |
| PETg |  | 1.57 |
| PET |  | 1.5750 |
| Crown glass (pure) |  | 1.50 - 1.54 |
| Flint glass (pure) |  | 1.60 - 1.62 |
| Crown glass (impure) |  | 1.485 - 1.755 |
| Flint glass (impure) |  | 1.523 - 1.925 |
| Pyrex (a borosilicate glass) |  | 1.470 |
| Cryolite |  | 1.338 |
| Rock salt |  | 1.516 |
| Sapphire |  | 1.762–1.778 |
| Sugar Solution, 25% |  | 1.3723 |
| Sugar Solution, 50% |  | 1.4200 |
| Sugar Solution, 75% |  | 1.4774 |
| Cubic zirconia |  | 2.15 - 2.18 |
| Potassium Niobate (KNbO3) |  | 2.28 |
| Silicon carbide |  | 2.65 - 2.69 |
| Cinnabar (Mercury sulfide) |  | 3.02 |
| Gallium(III) phosphide |  | 3.5 |
| Gallium(III) arsenide |  | 3.927 |
| Zinc Oxide | 390 | 2.4 |
| Germanium |  | 4.01 |
| Silicon | 590 | 3.962 |


Question
which material does not have a wavelength above 500nm?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["Zinc Oxide"]