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"Achromatic" Quotes from Famous Books
 ... The achromatic object-glass, invented by Dollond, about 1750, obviates this difficulty, and brings all the rays to nearly the same focus. Nearly every one interested in the subject is aware that this object-glass is ...
— Side-lights on Astronomy and Kindred Fields of Popular Science • Simon Newcomb
... sets of rays come to a focus in the same plane. Such a lens is called achromatic, or colourless. If you hold a common reading-glass some distance away from large print you will see that the letters are edged with coloured bands, proving that the lens is not achromatic. A properly corrected photographic lens would not show these pretty edgings. Colour correction is necessary also for lenses used ...
— How it Works • Archibald Williams |
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