一道光学计算题

Question

波长为500nm的单色点光源离光阑1m，光阑上有一个内外半径分别为0.5mm和1mm的透光圆环，接收点P离光阑1m，求P点的光强I与没有光阑时的光强度I0之比。

Answer 1

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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Answer 2

追问

有光阑时Ap怎么近似算成A1的？