| Answer | Crossword Clue |
|---|---|
| PILOT | Word before light or study |
| LOW | Word before fat or light |
| ULTRA | Word before light or sound |
| ULTRA | Word before "light" or "sound" |
| optronics | the study or use of devices involving the interaction of electronic and light signals |
| optics | The scientific study of sight and the behavior of light, or the properties of transmission and deflection of other forms of radiation |
