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//chapter8,Example8_1,pg 180
alpha=0.01
n=10
lam=6000*10^-8
u=1.5
//for dark fringe 2*u*t*cos(alpha)=n*lam
//t=xtan(alpha)
//2*u*x*sin(alpha)=2*u*x*alpha=n*lam ->alpha is small, sin(alpha)=alpha
x=(n*lam)/(2*u*alpha)
printf("distance of 10th fringe from edge of wedge\n")
printf("x=%.2f cm",x)
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