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//Example number 4.2, Page number 66
clc;clear;
close;
//Variable declaration
d=3.04*10**-10; //lattice spacing(m)
n=3; //order
lamda=0.79*10**-10; //wavelength(m)
//Calculation
theta=asin(n*lamda/(2*d)); //glancing angle(radian)
theta=theta*180/%pi; //glancing angle(degrees)
//Result
printf("glancing angle is %.3f degree",theta)
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