What does the word optics mean?

Usage examples for optics

  1. Townley states that Gascoigne had completed a treatise on optics, which was ready for publication, but that no trace of the manuscript could be discovered after his death. – The Astronomy of Milton's 'Paradise Lost' by Thomas Orchard
  2. I've got my eye on some companies- domestic natural gas, fiber optics, fuel cell technology. – O+F by John Moncure Wetterau