clc;
u=14;    //object distance in cm
f=-21;    //focal distance in cm
v=(-5/42);  //simplifying(1/f)=(1/v)-(1/u)
I=(3*-8.4)/(-14);   //using m=(1/0)=(v/u);
disp(v,"Image distance in cm = ");  //displaying result
disp(I,"I in cm = ");  //displaying result