光在n≠1的介质中传播时,位相差Δφ=2πδ/λ,其中()
A. δ是光程差,λ是介质中波长;
B. δ是光程差,λ是真空中波长;
C. δ是几何路程差,λ是真空中波长;
D. 以上说法都不正确。
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迈克尔逊干涉仪中,M1与M2垂直时,若M2向下移动,观察到干涉条纹()
A. 从中心冒出且变疏;
B. 从中心冒出且变密;
C. 从外向中心收缩;
D. 不能确定 。
Fill in the blanks with the proper forms of the nouns in the brackets.1. Players should be allowed to earn ________ (money) from adversity.
2. Most _________ (furniture) is made of wood.
3. I haven’t heard any _________ (news) from my son lately.