在折射率 n 3 = 1.52 的照相机镜头表面涂有一层折射率 n 2 = 1.38 的 MgF 2 增透膜,若此膜仅适用于波长 λ = 550nm 的光,则此膜的最小厚度为
A.
199.3 nm
B.
99.6 nm
C.
298.9 nm
D.
398.6 nm
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