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John Dollond (1706-1761), British optician and lens maker. John Dolland constructed precise optical instruments used in astronomical telescopes as well as eyeglasses. He is most well-known for his optics experiments that led to the independent development of the achromatic doublet lens, which he patented for commercial use in telescopes in 1758. This lens uses two glass pieces to focus two wavelengths (usually red and blue) within the same plane. He was awarded the 1758 Copley Medal by the Royal Society for his work, and was elected as one of its fellows three years later.
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