Focal point | optics | Britannica
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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
Focal Length of a Lens
Focal Length of a Lens
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File:Convex lens - Object between focal point and optical centre.png - Wikimedia Commons
What is Focal Length in Photography?
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