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The surfaces of lenses are usually small segments of large spheres. A line drawn through the centers of these spheres will also go through the center of the lens and is called the axis of the lens. All rays that enter a converging lens traveling parallel to its axis will be converged on the opposite side at a point called the principle focus or focal point as illustrated in figure 9.1a. For a diverging lens, parallel rays will be diverged outward so they appear to have originated at the focal point.
The focal length of a lens is the distance from the lens to the focal point. Since light may pass through a lens in either direction, there is a focal point, symmetrically located, on each side...
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