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### Lensmaker equation

The surface power of a lens = Ds = (nā- n)/r, where r is in meters, n = the index of the object space (air or fluid the lens is in) and nā = the index of the lens. This is also called the refractive power or simply the power of a spherical refracting surface.

The power of a thin lens (IOL) immersed in fluid

D

_{air}/D

_{fluid}= (n

_{IOL}ā n

_{air})/(n

_{IOL}ā n

_{fluid})

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