Definition that contains incident light
- black being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light
- white being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident light
- albedo the ratio of reflected to incident light
- orthicon a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
- image orthicon a now obsolete picture pickup tube in a television camera; electrons emitted from a photoemissive surface in proportion to the intensity of the incident light are focused onto the target causing secondary emission of electrons
- reflective power the ratio of reflected to incident light