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Principal focal point (two of them)
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File:Convex lens - Object on Focal point.png - Wikimedia Commons
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What is Focal Length in Photography?
File:Convex lens - Object between focal point and optical centre.png - Wikimedia Commons
What Is Focal Length in Photography?
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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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What is Focal Length in Photography?
