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clc//
//
//
//Variable declaration
s=1*10^-3; //size(m)
l=1*10^-3; //length(m)
lamda=650*10^-9; //wavelength(m)
//Calculation
tantheta=(l/2)/s;
theta=atan(tantheta); //angle(radian)
sintheta=(sin(theta));
ss=0.6*lamda/sintheta; //spot size(m)
//Result
printf("\n spot size is %0.3f micro m",ss*10^6)
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