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 the light source to {TAIL ~ a second fixed reflecting surface} 
to
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 the light source to { TAIL ~ a second fixed reflecting surface }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL