Achromatic doublet lens

Made:
1780
Achromatic doublet lens, English, c. 1780; focal lens 52 inches Achromatic doublet lens, English, c. 1780; focal lens 52 inches. Achromatic doublet lens, English, c. 1780; focal lens 52 inches.

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Achromatic doublet lens, English, c. 1780; focal lens 52 inches
King's College, London| Enquiries to Science Museum, London
© The Board of Trustees of the Science Museum

Achromatic doublet lens, English, c. 1780; focal lens 52 inches.
Science Museum Group
© The Board of Trustees of the Science Museum, London

Achromatic doublet lens, English, c. 1780; focal lens 52 inches.
Science Museum Group
© The Board of Trustees of the Science Museum, London

Achromatic doublet lens with a focal length of 52 inches, maker unknwon, England, c. 1780.

Achromatic doublet lenses reduce the chromatic aberration inherent in the images of single spherical lenses. They combine two types of glass with different dispersive powers, so that the ratio of the dispersive powers is equal to the ratio of their focal lengths. If this is the case, two colours will be brought to the same focus.

Details

Category:
King George III
Object Number:
1927-1571
type:
lenses and optics
taxonomy:
  • components
  • components
  • furnishing and equipment
  • tools & equipment
  • optical instrument
  • optical instrument component
credit:
King's College, London