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範例:折射定律

如右圖,一半徑10 cm的玻璃球(厚度很薄可忽略不計),其內裝有油(折射率1.2)及水(折射率4/3),若入射角為30oab為反射線,折射線分別在出射點距法線的距離,則a-b=?(A)0.2(B)0.5(C)0.7(D)1(E)1.2 cm

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