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![PDF] Zoomable telescope by rotation of toroidal lenses. | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/dd8461581bb113b62c8cacfce897d1b2abc7a052/3-Figure2-1.png "PDF] Zoomable telescope by rotation of toroidal lenses. | Semantic Scholar")
PDF] Zoomable telescope by rotation of toroidal lenses. | Semantic Scholar
