achromatic lens

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achromatic lens

A combination of lenses made of different glass, used to produce images free of chromatic aberrations.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ach′romat′ic lens′

a system of two or more lenses made of different substances so that different colors are focused at the same point, eliminating chromatic aberration.

[1860–65]

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Noun

achromatic lens - a compound lens system that forms an image free from chromatic aberration

compound lens - a lens system consisting of two or more lenses on the same axis

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One day, while browsing in the Charles Frank shop in Edinburgh, I found a secondhand 40mm achromatic lens. This was beyond the reach of my pocket money at the time but my father kindly bought it for me and this, fitted in a cardboard tube with a secondhand microscope eyepiece, became my first telescope.

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Although instrument-makers like Culpepper and Cuff made beautiful equipment, the real improvement in the microscope came with the invention of the achromatic lens.