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clear
//
//
//
//Variable declaration
theta=(5+(25/60))*%pi/180 //glancing angle(radian)
lamda=0.675 //wavelength of X-rays(angstrom)
n1=1 //order
n3=3 //order
//Calculation
d=n1*lamda/(2*sin(theta)) //lattice spacing(angstrom)
d=(d)
theta3=asin(n3*lamda/(2*d))*180/%pi //glancing angle for 3rd order(degrees)
theta3d=int(theta3) //glancing angle for 3rd order(degrees)
theta3m=(theta3-theta3d)*60 //glancing angle for 3rd order(minutes)
//Result
printf("\n lattice spacing is %0.3f angstrom",d)
printf("\n glancing angle for 3rd order is %0.3f degrees %0.1f minutes",theta3d,theta3m)
printf("\n answer for minutes given in the book varies due to rounding off errors")
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