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  1. Ellipse

    Linked via "vertex (of an ellipse)"

    The latus rectum is a chord passing through one focus, perpendicular to the major axis. Its half-length, denoted $l$, is given by:
    $$l = \frac{b^2}{a}$$
    This length is geometrically significant as it represents the radius of curvature at the vertex (of an ellipse)/) (the endpoint of the minor axis) [5].
    Optical Properties