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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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Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
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optics - What is the actual significance of the focal point of a lens? - Physics Stack Exchange
/principal-focal-point-(two-of-them)-convex-lens-35.5278959.jpg "Principal focal point (two of them)")
Principal focal point (two of them)
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