Difference between focus and principal focus of a lens
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If a beam of light moving parallel to the principal axis of a convex lens is incident on it, ray converge or meet at a point on the principal axis. This point F is called the focus.
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Principal focus is a point on the principal axis where the rays which are incident parallel to the principal axis meet after reflection. ... Focus is a point where rays parallel to each other meet. It is not necessary for the rays to be parallel to the principal axis.
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