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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);
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