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clear
//
//
//
//Variable declaration
d=2.82*10^-10; //lattice spacing(m)
theta=10; //glancing angle(degree)
n=1; //order
//Calculation
theta=theta*%pi/180; //angle(radian)
lamda=2*d*sin(theta)/n; //wavelength(m)
//Result
printf("\n wavelength is %0.5f angstrom",lamda*10^10)
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