Focal length
From ScienceZero
Revision as of 05:20, 15 February 2007 by Bjoern (Talk | contribs) (New page: The focal length of a lens is the distance from the lens to where a set of parallel rays entering the lens focuses to a point. This distance is measured in millimetres. [[image:Focallengt...)
The focal length of a lens is the distance from the lens to where a set of parallel rays entering the lens focuses to a point. This distance is measured in millimetres.
