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Figure 5 shows the double convex lens of Figure 4 with the assumed locations of the cardinal points indicated. These positions, which we shall now determine accurately, are at distances designated as l F, l F ′, l H, and l H ′ and are measured from the associated vertex. The object position can be called t, a positive quantity which is measured to the right from object to the first vertex ...
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2015-3-26u2002·u2002The distance from the lens to that point is the principal focal length f of the lens. For a double concave lens where the rays are diverged, the principal focal length is the distance at which the back-projected rays would come together and it is given a negative sign.
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