如图 a 所示,一光学平板玻璃 A 与待测工件 B 之间形成空气劈尖,用波长 l = 500 nm (1 nm= 10 -9 m ) 的单色光垂直照射.看到的反射光的干涉条纹如图 b 所示.有些条纹弯曲部分的顶点恰好与其右边条纹的直线部分的连线相切.则工件的上表面缺陷是( )
A.
不平处为凸起,最大高度为 500 nm .
B.
不平处为凸起,最大高度为 250 nm .
C.
不平处为凹槽,最大深度为 500 nm .
D.
不平处为凹槽,最大深度为 250 nm .
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