illumination vs optics

illumination

noun
  • The act of illuminating, or supplying with light; the state of being illuminated. 

  • Adornment of books and manuscripts with colored illustrations. See illuminate (transitive verb). 

  • Festive decoration of houses or buildings with lights. 

  • Enlightening influence; inspiration. 

  • Splendour; brightness. 

optics

noun
  • The physics of light and vision. 

  • Perception, image, public relations, especially in politics. 

  • The light-related aspects of a device. 

How often have the words illumination and optics occurred in a corpus of books? (source: Google Ngram Viewer )