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Examples using lens equation
MathType - The focal length for a positive converging lens in air is the distance from the lens to the point where the incident light beam is focused. It can be calculated
Displacement Method for finding Focal Length of Convex Lens Class 12Optics @Kamaldheeriya Maths easy
Will be the focal length of a lens be equal in both sides along the principal axis, if the radius of curvatures of the curved surfaces are different? - Quora
Focal Length Calculator
Cyberphysics - Lenses
How to use the Thin Lens Formula to model a thick lens -- PanoHelp.com