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//Variable declaration
theta=90; //angle(degrees)
lamda=1.5; //wavelength(angstrom)
d=1.6; //spacing(angstrom)
//Calculation
theta=theta*%pi/180; //angle(radian)
n=2*d*sin(theta)/lamda; //order of diffraction
//Result
printf('order of diffraction is %0.3f \n',int(n))
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