Classical Optics

Traditional optics is isolated into two principle branches: geometrical (or beam) optics and physical (or wave) optics. In geometrical optics, light is considered to go in straight lines, while in physical optics, light is considered as an electromagnetic wave.

Geometrical optics can be seen as an estimate of physical optics that applies when the wavelength of the light utilized is substantially littler than the extent of the optical components in the framework being demonstrated.