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Reflection
反射
Convergent
汇聚的
Ray
射线
Angle of Incidence
入射角
Normal
法线
Incident Ray
入射光线
Reflected Ray
反射光线
Angle of Reflection
反射角
Diffuse reflection
漫反射
Medium
介质
Laws of Reflection
反射法则
Luminous
发光的
Periscope
潜望镜
Divergent
发散的
Camera Obscura
针孔照相机
Beam
光束
Non-luminous
不发光的
Regular reflection
镜面反射