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LicenseAchromatic 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
King's College, London| Enquiries to Science Museum, London
© The Board of Trustees of the Science Museum
Achromatic doublet lens with a focal length of 52 inches, maker unknown, 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
- Materials:
- glass
- Measurements:
-
overall: x x 7 mm, 105 mm, .195kg
- type:
- lenses
- credit:
- King's College, London
