Define focus and principal focus.
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Principal focus is a point (on the principal axis) where parallel incident rays meet after reflecting (in mirrors) or refracting (in lenses). ... Principal Focus also determines the focal length of the lens/mirror. Focus is just a random point where some rays meet, it might be at the principal focus or otherwise
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Explanation: The reflected ray appears to come from a point on the principal axis.
This point the principal focus of convex lens.
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