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clear
//
//
//
//Variable declaration
h=1
k=1
l=0
lamda=0.065 //wavelength(nm)
n=2 //order
a=0.26 //axial length(nm)
//Calculation
x=n*lamda*sqrt(h**2+k**2+l**2)/(2*a)
theta=asin(x)*180/%pi //glancing angle(degrees)
//Result
printf("\n glancing angle is %0.1f degrees",theta)
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