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Definition

achromatic

Achromatic is an adjective that means “free of color.”  

In printing, achromatic is used as a synonym for “black and white.” A black and white print has shades of grey, but greyscale is also considered to be achromatic because it lacks hue, which means it cannot be classified as a subset of the colors red, green, blue (RGB) or yellow.

In optics, an achromatic lens is a composite lens made of up at least two different types of glass.  The lens is designed to reduce color errors. An achromatic lens transmits light without decomposing it spectrally.

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The Intranet Encyclopedia of Science has more information about achromatic lenses

This was last updated in June 2010

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