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//chapter8,Example8_3,pg 181
n=10
D10=0.5
lam=5000*10^-8
R=(D10^2)/(4*n*lam)
D50=sqrt(4*50*R*lam)
r50=D50/2
printf("radius of 50th dark ring\n")
printf("r50=%.2f cm",r50)
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