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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)