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光的全反射现象 光导纤维 PowerPoint PPT Presentation


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导入新课. 光的全反射现象 光导纤维. 第一章 光的折射. 1.2 全反射 光导纤维. 教学目标. 1. 知识与能力. 理解光的全反射现象; 知道什么是临界角; 了解光导纤维的作用; 观察光导纤维的应用。. 2 . 过程与方法. 学会从物理现象分析推导各介质的全反射临界角及适用条件的研究方法; 会判定实际应用中光导纤维的用途。. 3. 情感态度与价值观. 体会科学探究中的全反射思想,领悟用光导纤维实际中解决问题的优点,形成科学价值观。. 教学重难点.

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光的全反射现象 光导纤维

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1.2


1.


2 .

3.




1.



90



90


90C


nC

sin90

= n

sinc

1

=

sinc

n


24.432~4248.8



2.
















90

90C


1.4181

2.30

3.C=arcsin =arcsin =45

>40

4.


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