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//chapter8,Example8_10,pg 185
//condition for dark fringe is 2*t=n*lam
//refer to fig.(e) pg 185
//but B=(lam/(2*alpha*u))
//delt=alpha*x
lam=6000*10^-8
u=1.5
delt=(10*lam)/(2*u)//alpha=lam/(2*B*u), B=x/10
printf("difference t2-t1 from fig.\n")
printf("delt=%.4f cm",delt)
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