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+//To Calculate the smallest Diffraction Angle
+
+//Example 20.1
+
+clc;
+
+clear;
+
+a=2.6*10^-10;//Edge Length of Cubic Lattice
+
+h=1;//Miller Indice h
+
+k=1;//Miller Indice k
+
+l=1;//Miller Indice l
+
+lambda=1.542*10^-10;//Wavelength of light
+
+theta=asin(lambda*sqrt(h^2+k^2+l^2)/(2*a))*180/%pi;
+
+printf("Smallest Diffraction Angle=%.1f degrees",theta);