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A06B-6058-H231
A06B-6058-H231 用偏振滤镜可以水面、玻璃面和其他非金属表面反射光,这是因为在这些介面上反射光的偏振状态发生了变化。
光在不同折射率的介质的界面上会发生反射和折射。入射角与反射角、折射角的关系分别服从反射定律和折射定律。在非金属的界面上,当入射光线与折射光线成直角时,反射光线将是线偏振光,这就是有名的布儒斯特原理。此时的入射角就称为布儒斯特角。从下图可以看出,当光线从空气(介质1,严格地说应该是真空)射入介质2时,布儒斯特角的正切值等于介质2的折射率n。由于介质的折射率是与光波长有关的,对同样的介质,布儒斯特角的大小也是与光波长有关的。以光学玻璃折射率1.4-1.9计算,布儒斯特角大约为54-62度左右。当入射角偏离布儒斯特角时,反射光将是部分偏振光。
A06B-6058-H231
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