简述投影器的工作原理。
当投影器通电工作时,光源发出强光,凹面反射镜将光源向下发出的光线反射回来以加强亮度,再由新月镜、菲涅尔透镜集光,使光线平行而又均匀地照射在投影片上,透射过投影片的光线经过凸透镜成像,再由反射镜反射到屏幕上,就形成了明亮而清晰的图像。
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