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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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?
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(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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