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//Chapter-1,Example 1_24,Page 1-47
clc()

//Given Data:
//Dn=2*D40

//Calculations:
//As Dn^2=4*n*R*lam/u and Dn^2=4*D40^2
//i.e. 4*n*R*lam/u=4*4*40*R*lam/u .hence,
n=4*40          //order of the required ring
printf('Order of the dark ring which will have double the diameter of that of 40th ring is =%.0f ',n)