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![Cross section showing the internal structure of the optics tube and the... | Download Scientific Diagram Cross section showing the internal structure of the optics tube and the... | Download Scientific Diagram](https://www.researchgate.net/publication/327335859/figure/fig4/AS:665527169056769@1535685450348/Cross-section-showing-the-internal-structure-of-the-optics-tube-and-the-projected-light.png)