| Similarity | Rank | |
|---|---|---|
| prisms | 0.723 | 70462 |
| reflector | 0.723 | 34800 |
| photoelectric | 0.704 | 95795 |
| parabolic | 0.689 | 51347 |
| cathode | 0.685 | 42219 |
| diffraction | 0.673 | 50101 |
| luminaire | 0.673 | 97285 |
| optics | 0.672 | 21287 |
| illumination | 0.671 | 16924 |
| telescope | 0.666 | 15729 |
| Fourier | 0.665 | 57641 |
| LED's | 0.665 | 71808 |
| luminaires | 0.664 | 80412 |
| Reflector | 0.663 | 91646 |
| reflectors | 0.662 | 47762 |
| lithography | 0.659 | 70142 |
| diodes | 0.659 | 40668 |
| CCD | 0.655 | 34145 |
| prismatic | 0.653 | 94219 |
| pinhole | 0.652 | 60076 |
| thin-film | 0.649 | 77599 |
| LEDs | 0.649 | 18164 |
| eyepieces | 0.646 | 85711 |
| piezoelectric | 0.646 | 76776 |
| refraction | 0.644 | 48479 |