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File:Focal-length-a.png - Wikimedia Commons
File:Focal length.jpg - Wikimedia Commons
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File:Focal-length-a.png - Wikimedia Commons
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File:A diagram representing a convex mirror, which shows its focal point, focal length, center of curvature, and the principal axis.png - Wikimedia Commons
File:Camera focal length vs crop factor vs angle of view.svg - Wikimedia Commons
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If the focal length of a convex mirror is 10, what is the maximum distance at which the image can be formed by it? - Quora
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File:LensCropFactor.png - Wikipedia
File:Focal-length-d.png - Wikimedia Commons
Talk:Focal length - Wikipedia
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Flange focal distance - Wikipedia
File:Long focal length narrow angle view.svg - Wikipedia
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