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File:Convex lens - Object between focal point and optical centre.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
Question Video: Recalling the Definition for the Focal Length of a Concave Mirror and How It Relates to the Radius of Curvature | Nagwa
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The value of the focal length of the lens is equal to the value of the image distance when rays are (A) Passing through optical center(B) Parallel to the principal axis.(C) Passing
The Physics Classroom Website
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Question Video: Defining the Focal Length of a Convex Mirror | Nagwa
