The optical reproduction of an object, produced by a lens or mirror. A typical positive lens converges rays to form a “real” image which can be photographed. A negative lens spreads rays to form a “virtual” image which can’t be projected.
[box]Note: the International Commission on Illumination (CIE) recommended the following division:
IR-A: 700nm – 1400nm
IR-B: 1400nm – 3000nm
IR-C: 3000nm – 1mm[/box]
The viewing condition within which the eye is exposed to all or part of a laser beam.