凸透镜可以将平行光 成为一点,这一点就叫凸透镜的焦点,焦点到透镜中心的距离叫
来源:百度知道 编辑:UC知道 时间:2024/05/12 04:02:32
焦距
焦距
凸透镜资料:
http://baike.baidu.com/view/47418.html?wtp=tt
焦距:
http://baike.baidu.com/view/104209.htm
叫焦距。。。。
不过这句话怎么就读不通,,
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