The Importance of a Focal Point
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optics - What is the actual significance of the focal point of a lens? - Physics Stack Exchange
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/principal-focal-point-(two-of-them)-convex-lens-36.77d7742.jpg "Principal focal point (two of them)")
Principal focal point (two of them)
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File:Biconvex lens-behaviour of light rays from focal point.png - Wikimedia Commons
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