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+//Example number 4.1, Page number 66
+
+clc;clear;
+close;
+
+//Variable declaration
+d=0.282*10**-9; //lattice spacing(m)
+theta=8+(35/60); //glancing angle(degree)
+n=1; //order
+Theta=90; //angle(degree)
+//Calculation
+theta=theta*%pi/180; //angle(radian)
+Theta=Theta*%pi/180; //angle(radian)
+lamda=2*d*sin(theta)/n; //wavelength(m)
+nmax=2*d*sin(Theta)/lamda; //maximum order of diffraction
+//Result
+printf("wavelength is %.3f Angstrom",lamda*10**10)
+//answer varies due to rounding off errors
+printf("\n maximum order of diffraction is %d",round(nmax))