Optics is the science of light and its interaction with matter.

Optics is a broad subject area. Much of the content is covered in subcategories. Many basic concepts are covered in Category:Geometrical optics, in which light is considered as if it were composed of rays. Articles dealing with the wave nature of light can be found in Category:Physical optics. More advanced topics are in Category:Nonlinear optics, Category:Photonics, and Category:Quantum optics. For optical devices, see Category:Optical devices. For individual optical elements like lenses and mirrors, see Category:Optical components.