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一、要点解读1.平面镜①作用:只改变光束的传播方向,不改变光束的聚散性质.②成像特点:成等大、正立的虚像,物和像关于平面镜对称.③成像作图法: a.反射定律法:从物点作任意两光线射向平面镜,由反射定律作其反射光线,反射光线的反向延长线交点即为虚像点. b.据平面镜成像特点,即物像关于镜面对称.作物点到镜面的垂直线,在此垂直线上的镜面的另一侧截取与物点到镜面距离相等的点,即为虚像点.注意作图应规范,光线要画表示方向的箭头,实线虚线要分明,对称法只能用来确定像的位置,作
First, the point of interpretation 1. Plane mirror ① role: only change the direction of the beam, does not change the convergence of the nature of the beam. ② imaging features: into a large, upright virtual images, objects and images on the mirror symmetry.③ imaging mapping method : a. Law of reflection law: For any two light rays from the object point to the plane mirror, the law of reflection for its reflected light, the reverse of the reflected light line is the virtual point of intersection. b. According to the characteristics of the plane mirror imaging, Mirror symmetry Crop point to the mirror of the vertical line, the vertical line on the other side of the mirror and interception of the object point to mirror the distance equal to the point, that is the virtual image point. Note that the mapping should be standardized, the light to draw the direction Arrow, solid dotted line to be clear, symmetry method can only be used to determine the location of the image, for