题目内容

真空中波长为m单色光,在折射率为n的均匀透明媒质中,从A点沿某一路径传播到B点,路径的长度为l . A、B两点光振动位相差记为Dj, 则( )

A. 当l = 3m/2 ,有Dj = 3 pi
B. 当 l = 3 m / (2n) , 有Dj = 3 n pi
C. 当 l = 3 m/(2 n) ,有Dj = 3 pi
D. 当 l = 3 n m/2 , 有Dj = 3 n pi

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单色平行光垂直照射在薄膜上, 经上下两表面反射的两束光发生干涉,如图8.2.1所示,若薄膜的厚度为e , 且n1<n2> n3 , l1 为入射光在n1 中的波长,则两束光的光程差为 ( )

A. 2 n2 e
B. 2 n2 e-l1 / (2 n1)
C. 2 n2e-(1/2)n1l1
D. 2 n2e-(1/2)n2l1

一束波长为 l 的单色光由空气垂直入射到折射率为n 的透明薄膜上, 透明薄膜放在空气中, 要使反射光得到干涉加强, 则薄膜最小的厚度为( )

A. l / 4
B. l / (4 n)
C. l / 2
D. l / (2 n)w

( )is power equipment.

A. battery
B. audio
C. wiper
D. starting system

()conveys the drive to the wheels . The main components are clutch , gearbox , driveshaft , final drive , and differential .

A. Brake system
B. Steering system
C. Transmission system
D. Suspension system

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