Optics of a divergent lens. 19th-century illustration showing the optics of a divergent lens, with the principal virtual focal points labelled. This i

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Optics of a divergent lens. 19th-century illustration showing the optics of a divergent lens, with the principal virtual focal points labelled. This illustration is from 'Physique Populaire' (Emile Desbeaux, 1891).

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Photo credit: © Science Photo Library / Alamy / Afripics
License: Licensed
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