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clc;
f=80; //focal length in cm
f1=20; //focallength of first lens in cm
f2=(80/3); //using (1/F)=(1/f1)+(1/f2)
P=(100/f); //power in D
P1=100/20; //power of first lens
P2=P1-P; //power in D
disp(P2,"Power in D = "); //displaying result
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