Retrieving "Parallel Rays Of Light" from the archives

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1. Spherical Mirror

   Linked via "parallel rays of light"

   Focal Point and Focal Length
   The principal focus or focal point (F)/) is the location where parallel rays of light incident upon the mirror converge (concave) or appear to diverge from (convex) after reflection.
   Under the paraxial approximation, the focal point/) is located exactly midway between the pole/) and the [center of curvature](/entries/center…