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//Example 23_3
clc();
clear;
//To find the focal length of the combination
d1=20 //units in cm
d2=-30 //units in cm
d3=60 //units in cm
p1=100/d1 //units in dipoters
p2=100/d2 //units in dipoters
p3=100/d3 //units in dipoters
p=1/(p1+p2+p3) //Units in diopters
printf("The combined focal length is=%.1f cm",p)
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