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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
Lens Focal Length Defined and Explained | Photzy
What is Focal Length in Photography? - Focal Length Explained
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What is Focal Length in Photography? - Focal Length Explained
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What is Focal Length in Photography? - Focal Length Explained