A/Prof. David Lancaster from IPAS (University of Adelaide) talks to teachers about Photonics: - What is light, and what is photonics? - How is photonics used in the real world? Laser surgery, mining, greenhouse gas detection etc. - What does someone working in photonics do on a day-to-day basis? - How did you become interested in Photonics? This recording is from PDplus:Photonics, a professional development event for high school teachers.