A06B-6058-H231

A06B-6058-H231 用偏振濾鏡可以水面、玻璃面和其他非金屬表面反射光，這是因?yàn)樵谶@些介面上反射光的偏振狀態(tài)發(fā)生了變化。

光在不同折射率的介質(zhì)的界面上會發(fā)生反射和折射。入射角與反射角、折射角的關(guān)系分別服從反射定律和折射定律。在非金屬的界面上，當(dāng)入射光線與折射光線成直角時(shí)，反射光線將是線偏振光，這就是有名的布儒斯特原理。此時(shí)的入射角就稱為布儒斯特角。從下圖可以看出，當(dāng)光線從空氣（介質(zhì)1，嚴(yán)格地說應(yīng)該是真空）射入介質(zhì)2時(shí)，布儒斯特角的正切值等于介質(zhì)2的折射率n。由于介質(zhì)的折射率是與光波長有關(guān)的，對同樣的介質(zhì)，布儒斯特角的大小也是與光波長有關(guān)的。以光學(xué)玻璃折射率1.4-1.9計(jì)算，布儒斯特角大約為54-62度左右。當(dāng)入射角偏離布儒斯特角時(shí)，反射光將是部分偏振光。

A06B-6058-H231 

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