光学 guāngxué optics Definitions Defs Origin Strokes Stroke Words Sentences Sents 光学仪器 guāngxuéyíqì optical instrument 光学字符识别 guāngxuézìfúshíbié OCR optical character recognition (OCR)光学显微镜 guāngxuéxiǎnwēijìng optical microscope 光学雷达 guāngxuéléidá lidar 几何光学 jǐhéguāngxué geometric optics 非线性光学 fēixiànxìngguāngxué nonlinear optics nonlinear optics (physics)