(informal) Astronomy using observations using telescopes and recording media that capture visible light. / (astronomy) Astronomy using infrared, visible, and/or ultraviolet wavelengths.

plural of optical isomer

The optical axis. / (crystallography, mineralogy) The direction in which a ray of light passing through a crystal does not suffer double refraction.

A class of glass used to create optical lenses, such as that for spectacles or spyglasses

(computing) A mouse (pointing device) that uses a light source and a light detector (for example, an LED and an array of photodiodes) to detect movement, as opposed to the earlier mechanical mouse.

plural of optical mouse

plural of optical fiber

plural of optical disc

(computer hardware) A drive that reads optical media.

plural of optical spectrum