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試卷名稱：113年 - 113 臺灣綜合大學系統_學士班轉學生聯合招生考試：普通物理A#125298
年份：113年
科目：研究所、轉學考(插大)◆普通物理學
18. The figure shows a thin film (in the middle) with different materials on either side: n₁ = 1.40, n₂ = 1.50, and n₃ = 1.60. We send in a ray of light that is perpendicular to the two parallel surfaces. In air, that light has a wavelength of 800 nm. For some values of thickness L, the reflections to the left undergo fully destructive interference. What is the second smallest value of L that gives that result? Answer in nanometers.
(A) 1200,
(B) 180,
(C) 400,
(D) 75,
(E) 533.
