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clear
//
//
//
//Variable declaration
d=3.04*10**-10 //lattice spacing(m)
lamda=0.79*10**-10 //wavelength(m)
n=3 //order
//Calculation
x=n*lamda/(2*d)
theta=asin(x)*180/%pi //glancing angle(degrees)
//Result
printf("\n glancing angle is %0.3f degrees",theta)
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