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+// Exa 1.21.2

+clc;

+clear;

+close;

+// Given data

+lembda = 1.6;// in Å

+lembda = lembda * 10^-10;// in m

+theta = 14.2;// in degree

+n = 1;

+//Formula 2*d*sin(theta) = n*lembda;

+d = (n*lembda)/(2*sind(theta));// in m

+d = d * 10^10;// in Å

+disp(d,"The spacing of atomic layer in the crystal in Å is");