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Power of a spherical lens

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Power of a spherical lens diagram
The power of a spherical lens can be estimated from the radius of curvature of its two faces and the refractive index difference between the lens and its medium.
Radius 1
Radius 2
Refractive index of lens
Refractive index of medium

Lens strength
Focal length
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The refractive index of the medium should be 1 if the medium is air, 1.33 for water, and ~1.4-1.5 for oil. Lens refractive index may be around 1.5 (glass) to 1.6 (polycarbonate), or higher for specialized materials.