部编沪科版八年级物理上册优质课件-第2课时-探究凸透镜成像规律.ppt

部编沪科版八年级物理上册优质课件-第2课时-探究凸透镜成像规律.ppt

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第2课时探究凸透镜成像规律,沪科版八年级物理上册,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,1.透镜是利用光的_规律制成的，透镜有两类：

一类是中间比边缘厚的透镜叫做_，如_镜片；另一类是中间比边缘薄的透镜叫_，如_镜片。

温故知新：

折射,凸透镜,远视眼镜,凹透镜,近视眼镜,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,2._在透镜中心处，通过两个球面球心的直线叫做透镜的_。

3.凸透镜对光有_作用，凹透镜对光有_作用。

4.平行光通过凸透镜，将会聚到主光轴上的一点，这个点称为凸透镜的_，_到光心的距离叫做_，一个透镜有两个_。

光心,主光轴,会聚,发散,焦点,焦点,焦距,焦距,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,凸透镜在生产、生活中具有广泛的运用。

倒立、放大的实像,倒立、缩小的实像,正立、放大的虚像,下面，我们来探究一下凸透镜成像的特点。

状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,探究问题：

实验方案：

像的虚、实，大、小，正、倒跟物距有什么关系呢？

状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,

（1）实验器材：

烛焰、透镜、光屏三者的中心处于同一水平高度。

（2）两个物理名词及实验前的调节：

凸透镜、蜡烛、光屏、火柴、光具座,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,物距：

物体到光心的距离，用u表示。

像距：

像到光心的距离，用v表示。

焦距：

焦点到光心的距离，用f表示。

2倍焦距：

距离为焦距的两倍（从光心开始），用2f表示,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,进行实验与收集证据,1.设法获取凸透镜的焦距。

2.认识光具座，将实验器材按蜡烛、凸透镜、光屏的顺序放置在光具座上。

3.蜡烛火焰经凸透镜后成缩小的实像，将u、v值记录下来。

4.蜡烛火焰经凸透镜后成放大的实像，将u、v值记录下来。

5.蜡烛火焰经凸透镜后成等大的实像，将u、v值记录下来。

6.蜡烛火焰经凸透镜后成放大的虚像，将u值记录下来。

7.蜡烛火焰放在凸透镜的焦点处，观察是否能成像。

8.改变物距，重复几次上面的实验操作。

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