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Lensmaker's Equation

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Jul 7, 2022, 5:14:51 PM
Created by
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Jun 17, 2016, 6:36:43 PM
f=[(n1)1r1+1r2]1
(n)index of refraction
(r1)radii of curvature 1
(r2)radii of curvature 2
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The Lensmaker's Equation is used to calculate the focal length of a lens immersed in a medium with an index of refraction of 1. The equation is:
f=[(n1)1r1±1r2]1, where:

  • n = index of refraction
  • r1 = radii of curvature
  • r2 = radii of curvature

The positive sign is used when both surfaces are curved outward or both are curved inward; otherwise a negative sign applies. (In vCalc, enter r2 as negative if both surfaces are not curved in the same direction.)

References

31.3 The lensmaker's equation by Benjamin Crowell, Light and Matter  licensed under the Creative Commons Attribution-ShareAlike license.


This equation, Lensmaker's Equation, is used in 2 pages
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