//Example 25.7
d_o=7.5*10^-2;//Object distance (m)
f=10*10^-2;//Focal distance (m)
d_i=1/(1/f-1/d_o);//Image distance (m)
m=-d_i/d_o;//Magnification
printf('Magnification produced by magnifying glass = %0.2f',m)
//Openstax - College Physics
//Download for free at http://cnx.org/content/col11406/latest