| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| history of fresnel lens | 0.32 | 0.4 | 4209 | 24 | 23 |
| history | 0.88 | 0.1 | 6652 | 76 | 7 |
| of | 0.67 | 0.9 | 1287 | 13 | 2 |
| fresnel | 0.15 | 0.5 | 9419 | 10 | 7 |
| lens | 1.33 | 0.1 | 567 | 60 | 4 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| history of fresnel lens | 1.25 | 0.4 | 277 | 77 |
