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【简答题】
如图所示, ABCD 是某种透明材料的截面, AB 面为平面, CD 面是半径为 R 的圆弧面, O 1 O 2 为对称轴;一束单色光从 O 1 点斜射到 AB 面上折射后照射到圆弧面上 E 点,刚好发生全反射, ∠ O 1 O 2 E = 30° , DO 2 ⊥ CO 2 ,透明材料对单色光的折射率为 ,光在真空中传播速度为 c ,求: ( i )单色光在 AB 面上入射角 α 的正弦值;(结果可以用根号表示) ( ii )光在透明材料中传播的时间(不考虑光在 BC 面的反射)。(结果可以用根号表示)
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举一反三
【单选题】One of the prominent factors that has made GIs presence in South Korea particularly tougher because ______ .
A.
a few bad apples have dented the reputation of the American servicemen in South Korea
B.
many Koreans have biased views against American servicemen
C.
some foreign countries had their soldiers present in South Korea in the past
D.
South Korea no longer needs U. S. economic aid
【单选题】One of the prominent characteristics of a law is______ .
A.
the result on the individual' s behavior. on which a restraining influence is being exercised
B.
the result of a behavior. on the members of the governmental agency
C.
the result of a behavior. on ordinary citizens
D.
both A and B
【简答题】America had no prominent_____of its own. No one knows exactly when was invented or by whom A.music B.songs C.melodies D.tunes
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