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//Example number 4.3, Page number 66
clc;clear;
close;
//Variable declaration
a=0.28*10**-9; //lattice spacing(m)
n=2; //order
lamda=0.071*10**-9; //wavelength(m)
h=1;
k=1;
l=0;
//Calculation
d110=a/sqrt(h**2+k**2+l**2); //spacing(m)
theta=asin(n*lamda/(2*d110)); //glancing angle(radian)
theta=theta*180/%pi; //glancing angle(degrees)
//Result
printf("glancing angle is %.2f degree",theta)
//answer in the book is wrong
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