focal length the focal length of an optical system is a measure of how strongly the system converges or diverges thick lens diagram for a thick lens understand focal length in 4 easy steps expert graphy focal length can be quite hard to understand what does 35mm actually mean this article will give you a new understanding of the how focal length works focal point and focal length ray diagram for lenses 2 focal points f=f 1=f 2 focal length f 2 f 0 converging f 0 diverging focal point and focal length focal point f the point to which light beam parallel to principal axis converge focal length f distance between focal point and the mirror or lens each lens has two focal points each mirror has one converging lenses ray diagrams ray diagram for object located at the focal point thus far we have seen via ray diagrams that a real image is produced when an object is located more than one focal length from a converging lens and a virtual image is formed when an object is located less than one focal length from a converging lens i e in front of f opd diagrams explained cff telescopes within this model we could calculate the focal length of every zone of the lens for every colour when spot diagrams can still be used focal length definition equation & examples video this lesson explains the meaning of focal length and optical power presents the equations to calculate these values and gives an example for each ray diagrams amherst 1 the focal length 2 the object distance 3 the magnifying power 4 one half the radius of curvature of one of the lens faces 5 the average radius of curvature of the two lens faces equivalent focal length calculator you need only specify the focal length of the individual enter the focal lengths of the the lens types shown in the diagram are for

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