nonspectral line

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colour — /kul euhr/, n., adj. v.t., v.i. Chiefly Brit. color. Usage. See or1. * * * I Aspect of any object that may be described in terms of hue, brightness, and saturation. It is associated with the visible wavelengths of electromagnetic radiation, which … Universalium
eye, human — ▪ anatomy Introduction specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit The eye is protected from mechanical injury… … Universalium
tristimulus system — ▪ colour a system for visually matching a colour under standardized conditions against the three primary colours red, green, and blue; the three results are expressed as X, Y, and Z, respectively, and are called tristimulus values. For… … Universalium

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