Convex and concave lens, vector illustration diagrams. Labeled scheme with light ray direction and bending through lens. Controlling focal length and focus point for optometry equipment. premium vector by VectorMine

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curve graphic focus design model light tech flow structure cross visual drawing camera lens science section spread beam ray point length reflect sight vision parts optic distance guide plane scheme focal bend magnify educational info diagram example axis concave explanation convex function principal farsightedness labeled

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