These notes treat of the Leaving Certificate Physics course. Only the most important parts of any topic are included; as such, these notes form 'the minimum you need to know to get an A1'. Clear diagrams are included to illustrate important material in the text, especially in Light 1: Geometrical Optics with its inherently graphical nature. It is important to note that significant emphasis is placed on the theoretical part of the syllabus: each student's own experiment copybook should be their keystone for that aspect of the course. However, for the sake of completeness appendix B forms a concise overview of the mandatory experiments, with particular emphasis on those salient points which frequently crop up in exams. Moreover, the Applied Electricity option has been omitted since seldom do students warm to it, and indeed very few teachers cover it; the particle physics option is included instead in the Modern Physics section.