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  1. Geometrical optics
  2. Applied geometry
  3. Applied mathematics
  4. Fields of mathematics
  5. Mathematics
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Focal length by Ciro Santilli 34 Updated 2024-12-15 +Created 1970-01-01
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If you pass parallel light.
For a biconvex spherical lens, it is given by:
(1)
where:
  • n: f nidnex
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