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//Example 26.3
d_i=(-30+1.5)*10^-2;//Image distance (m)
d_o=%inf;//Object distance (m)
P=1/d_o+1/d_i;//Power (D)
printf('Power of spectacle lens required = %0.2f D',P)
//Openstax - College Physics
//Download for free at http://cnx.org/content/col11406/latest
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