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//Ex:8.17
clc;
clear;
close;
y=630*10^-9;// operating wavelength in m
w=25*10^-6;// spot size in m
x=2*y/(3.14*w);// divergence angle in radians
x1=x*180/3.14;// divergence angle in degree
printf("The divergence angle =%f radians", x);
printf("\n The divergence angle =%f degree", x1);
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