Define principal focus and focal length?
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The principal focus of a convex lens is a point on its principal axis to which light rays parallel to the principal axis converge after passing through the lens. The focal length is the distance of the principle focus from the optical center of a lens.
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The principal focus of a convex lens is a point on its principal axis to which light rays parallel to the principal axis converge after passing through the lens. The focal length is the distance of the principle focus from the optical center of a lens.
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