Definition of secondary color

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Photonics Dictionary

secondary color

An aberration that remains after primary color is corrected. Primary color causes the back focus of a lens to vary with wavelength; for example, blue light comes to focus closer to the lens than green, and green closer than red. In correcting this, it is found that blue and red light may be made to focus at the same place, but that this place is slightly farther from the lens than the focus for green light.

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