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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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Define focal length.
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/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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Lesson 4 Define the terms principal axis, focal point, focal length and linear magnification as applied to a converging (convex) lens. Define the power. - ppt download
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What is Focal Length in Photography? - Focal Length Explained
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Focal length - Wikipedia
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