optics

Short definition from Wiktionary

Noun

1. 1
   The physics of light and vision: basic optical science.
2. 2
   Technology that makes use of such physics: applied optical science; business lines making use of such technology.
3. 3
   The light-related aspects of a device.
4. 4
   Perception, image, public relations, especially in politics.
5. 5
   plural of optic