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試卷名稱：91年 - 91 學士後西醫：物理#85626
年份：91年
科目：學士後西醫-物理
8.Some sunglasses are coated on one side with a thin film of MgF2 to reduce reflection from the glass surface.
The index of refraction of MgF2 is 1.38; that of the glass is 1.50. What is the least coating thickness that
eliminates (via interference) the reflections in the range of the visible spectrum (≒
550nm)? Assume that
the light is approximately perpendicular to the glass surface.
(A)40nm
(B)60nm
(C)80nm
(D)100nm
(E)120nm