平面镜成像中不能用平面镜代替玻璃板.
因为,在实验操作中,需要看到物所在的另一侧的像的位置,便于实物与像重合操作.
或者说,选择玻璃板代替平面镜主要是利用玻璃板透明的特点,便于确定像的位置.
另外,使用较薄的玻璃板,是为了避免玻璃板的两个表面同时成像所造成的分不清像的位置.
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