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【单选题】
两块平玻璃构成空气劈形膜,左边为棱边,用单色平行光垂直入射。若上面的平玻璃慢慢地向上平移,则干涉条纹( )
A.
边方向平移，条纹间隔变小
B.
边方向平移，条纹间隔变大
C.
边方向平移，条纹间隔不变
D.
向远离棱边的方向平移，条纹间隔不变
E.
向远离棱边的方向平移，条纹间隔变小
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