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//chapter8,Example8_6,pg 183
lam=6300*10^-10
u=1.5
//condition for dark 2*u*t=n*lam
//condition for bright 2*u*t=(2*n-1)(lam/2)
//when t=0 n=0 order dark band will come and at edge 10th bright band will come
n=10
t=(((2*n)-1)*(lam))/(4*u)
printf("thickness of air film\n")
printf("t=%.12f cm",t)
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