optics

The branch of physics that deals with light and vision, chiefly the generation, propagation, and detection of electromagnetic radiation having wavelengths greater than x-rays and shorter than microwaves.

That branch of physical science which treats of the nature and properties of light, of the theory of colors (chromatics), of the change which light suffers either in its qualities or in its course when refracted or transmitted through bodies (dioptrics), when reflected from their surfaces or when passing near them (catoptrics), of the structure of the eye and the laws of vision, and of the construction of instruments of introspection, as telescopes, microscopes, etc.

That branch of physical science which treats of the nature and properties of light, the laws of its modification by opaque and transparent bodies, and the phenomena of vision.

The physics of light and vision.

The light-related aspects of a device.