|The Interactive Geometry Software||Gallery||Browser||Download|
Parallel light rays meet in the focal point of a lens. The distance between the focal point f and the lens is called focal distance. Light rays that go throught the midpoint of the lens are not influenced by it.
|Change the position and the focal distance of the lens as well as position and size of the object using the mouse!|
|These properties enable us to do a geometric construction of the image A'B' of an object AB. The point B' is the meet of the line through B and the midpoint and the line which can be found by following the light through the focal point.|
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