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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)
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
Focal length - Wikipedia
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Focal points and focal planes, Gaussian optics
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What Is Focal Length in Photography?
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Focal Length of a Lens
