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//To calculate the divergence
a2 = 6; //spot diameter, mm
a2 = a2*10^-3; //spot diameter, m
a1 = 4; //spot diameter, mm
a1 = a1*10^-3; //spot diameter, m
d2 = 2; //distance from laser, m
d1 = 1; //distance from laser, m
theta = (a2-a1)/(2*(d2-d1)); //divergence, radian
theta = theta*10^3; //divergence, milli radian
printf("divergence is %d milli radian",theta);
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