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Gallery: Optics

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.

Please enable Java for an interactive construction (with Cinderella).
Change the position and the focal distance of the lens as well as position and size of the object using the mouse!
Please enable Java for an interactive construction (with Cinderella). 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.