試卷名稱:112年 - 112 台灣聯合大學系統_碩士班招生考試:普通物理#117881
年份:112年
科目:研究所、轉學考(插大)◆普通物理學
18. An optical fiber has an index of refraction, n=1.5, and diameter, d = 10.0 um. It is surrounded by vacuum (n=1.0). When light is sent into the fiber along its axis, find the minimum outside radius, R, permitted for a bend in the fiber if no light is to escape?
(A) 16.7 um,
(B) 20.0 um,
(C) 25.0 um,
(D) 30.0 um,
(E) 50.0 um.