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如图所示，M为起振偏器，N为检偏振器．今以单色自然光垂直入射．若使M和N的偏振化方向相互垂直，则通过N后的光强为零．若在M和N之间插入另一偏振片C，它的M及N均不相同，则通过N后的光强如何? 若将偏振片C转动一，试定性画出光强对转动角度的关系曲线．
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