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华师大版科学八年级下册教材第18页介绍了利用方格纸、茶色玻璃(作为平面镜)、棋子等探究平面镜成像规律的实验方法,如图1所示。该方法所需器材简易,学生通过分组实验不难得到平面镜成像的规律。一、教材装置不足之处1.教材装置采用棋子取代燃烧的蜡烛,但棋子在平面镜中所成的像不仅不够清晰,而且无法观察像与物在形状上的对称性。2.教材装置只能探究平面镜垂直于水平面时成
On the 18th page of the Huashi Normal University Edition Eighth Grade Book, page 18 introduces an experimental method for exploring the imaging law of plane mirrors using squared paper, brown glass (as a plane mirror), and chess pieces, as shown in Figure 1. The equipment required by this method is simple, and students can easily obtain the law of planar mirror imaging through grouping experiments. 1. Inadequacies of Textbook Device 1. The teaching material device uses a chess piece to replace the burning candle, but the image formed by the chess piece in the plane mirror is not only not clear enough, but also cannot observe the symmetry of the shape of the object. 2. The textbook device can only explore when the plane mirror is perpendicular to the horizontal plane.