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【简答题】
在双缝干涉实验装置的两个狭缝后各放一个偏振片. (1)若两偏振片的偏振化方向相互垂直,单色自然光入射后在屏上是否有干涉条纹? (2)若两偏振片的偏振化方向相互平行,光强为 的单色自然光入射到每一条缝上,是否有干涉条纹产生,光强分布如 (3)若在(1)中的一缝后,紧贴偏振片再放一片光轴与偏振片透光方向成 角的二分之一波片,如图所示,干涉条纹又如何变化?
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举一反三
【单选题】There is an essential ______ in human gestures, and when someone raises the palms of his hands together, we do not know whether it is to bury himself in prayer or to throw himself into the sea.
A.
economy
B.
dignity
C.
insincerity
D.
reverence
E.
ambiguity
【单选题】—Hi, James. There is someone _______ for you at the school gate. —It may be my mother. She comes to see me. [ ]
A.
waited
B.
waiting
C.
to wait
【单选题】If someone raises his profile, he _____.
A.
impresses others by his appearance
B.
gets more attention from the public
C.
gain strength gradually
D.
improves his resume
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