In optics, If focal point is also called the “focus” and if focal length is fixed to every kind of lens, then why the closer the point source the farther the focus and the farther the point source the closer the focus?
In: Physics
A lens will focus parallel light beams into its focal length (means that every parallel light beam from beginning will be directed through a single point, which is given by the focal length).
If you have beams which are not parallel but already have some kind of angle to begin with, they will be focused at a different point (which will also depend on the focal length of the lens but also on how the incoming light looks like).
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