Optics is the branch o pheesics which involves the behaviour an properties o licht, includin its interactions wi matter an the construction o instruments that uise or detect it. Optics uisually describes the behaviour o veesible, ultraviolet, an infrared licht. Acause licht is an electromagnetic wave, ither furms o electromagnetic radiation such as X-rays, microwaves, an radio waves exhibit seemilar properties.
- McGraw-Hill Encyclopedia of Science and Technology (5th ed.). McGraw-Hill. 1993.