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)")
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:max_bytes(150000):strip_icc()/creating-and-defining-a-focal-point-452316-hero-12b1e2eb9f494e439d09e73f620c1fb6.jpg "14 Beautiful Focal Point Ideas for Living Rooms")
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File:Convex lens - Object between focal point and optical centre.png - Wikimedia Commons
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Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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