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In this slide the incident rays are parallel to each other, even though they are not parallel to the axis. So the plus-power lens adds positive vergence to rays that had zero vergence, and they will converge and cross each other -- but not on the axis. This is not the secondary focal point; that point is ON the axis. It is, however, on the focal plane. If we did this with lots of groups of parallel rays and connected all the points where each group of parallel rays crossed, we would have a surface on the right side of the lens. This is what is happening inside your eye when you are focused for distance vision (and are wearing your glasses if you need them). The focal plane is curved, like the retina inside your eye. We will, however, illustrate it as flat for the same reason that we draw the lens as a straight line: to make our diagrams easier to understand. |
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