Final answer:
If an invention uses light, the root words 'photo' or 'lum' are likely to be part of the invention's name, denoting its relation to light. These roots are evident in words like photography, luminary, and photoelectric, reflecting the invention's function related to light.
Step-by-step explanation:
If you invented something that used light, the root word likely to be in your invention's name would be photo or lum. These are derived from the Greek and Latin words for light, respectively. For instance, the word photography combines 'photo-' meaning light, and '-graphy' meaning writing or drawing, referring to the process of recording images using light. Similarly, words like luminary (a light-giving body), luminescence (light emission), and illumination (the act of lighting up) also have these roots. The word photoelectric might be used if your invention involved the conversion of light into electrical signals.
Thomas Edison, known for his invention of the lightbulb, demonstrated the importance of understanding how light can be manipulated and utilized through his extensive research and development. He led a large research laboratory, setting a precedent for organized research in developing new technologies, including those related to light. Following his model, the use of the root words 'photo' or 'lum' in your invention would reflect an understanding of the properties and applications of light.