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Principal Focus or Focus:
After reflection, light rays parallel to the principal axis of a mirror either pass
through a point (in the case of a concave mirror) or appear to diverge from a point
(in the case of a convex mirror), and this point is referred to as the mirror's
principal focus or focal point.
Focal Length: The focal length of a mirror is the distance between the pole and
the focus. It is symbolized by the letter f.
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