Monday, May 22, 2006

37

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
Dair/Dfluid = (nIOL ā€“ nair)/(nIOL ā€“ nfluid)

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