A first reflecting surface of an ellipse group reflecting surface preferably has a first focus on the light source and a second focus, capable of being inserted in or removed from {HEAD ~ an optical path} from {TAIL ~ the light source} to a second fixed reflecting surface 
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A first reflecting surface of an ellipse group reflecting surface preferably has a first focus on the light source and a second focus , capable of being inserted in or removed from { HEAD ~ an optical path } from { TAIL ~ the light source } to a second fixed reflecting surface
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