Portrait of the English optician John Dollond,1706-1761. The son of a French Huguenot refugee Dollond was for many years a silk-weaver. In 1752,however,he joined his son Peter in his business as an optician. They attacked the problem of chromatic aberration,i.e. the colour fringes in the images produced by a simple lens,which Newton had considered inherent in lenses. A largely achromatic compound lens had been designed and used in telescopes from 1733. The Dollonds,using improved glass,produced good quality achromatic lenses from 1758,which led to nearly colour-free refracting telescopes and better microscopes being made | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
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