一道有关光学的计算题The refractive index of core and cladding for a 1k

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一道有关光学的计算题
The refractive index of core and cladding for a 1km length single mode fiber is 1.47 and 1.45 respectively.The time taken for the light to travel in this fiber is

$一道有关光学的计算题The refractive index of core and cladding for a 1k$

alright,i'm a little drunk now,but i can still answer your question:
internal total reflection condition:
n1sin p=n2 sin pi/2 ===> sin p=0.98639455782312925170068027210884
total time = (L/sin p) /(c/n2) =(1000/0.98639455782312925170068027210884)/(299792458/1.45)=4.9033921994128363799714010012292e-6

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