Optics, Photonics & Laser

Geometrical Optics

Geometrical optics, or ray optics, is a model of optics that describes light propagation in terms of rays. The ray in geometric optics is an abstraction useful for approximating the paths along which light propagates under certain circumstances. Three basic laws: The law of rectilinear propagation (transmission). When a ray of light is reflected at an interface dividing two optical media, the reflected ray remains within the plane of incidence, and the angle of reflection θ r equals the angle of incidence θ i.