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

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

plural of optical mouse

(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 optic axis

plural of optical spectrum

plural of optical spectrum

A scientific instrument that uses lasers to manipulate objects on the micron scale as if by using tweezers.

plural of optical wand

A wand-like device for optical character recognition.