Fundamentals of geometrical optics

Focus, focal distance, refracting power

The image focus is the image of the point towards infinity on the axis :

F' is the image focus, is the image focal distance of the diopter.

The object focus is such that its image is to infinity on the axis :

F is the object focus is the object focal distance of the diopter.


   
    Figure 15
Figure 15 [zoom...]

f and f ' and the diopter refracting power Cv are linked by the following relationship :

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