Jawabanmu

2014-05-13T20:30:03+07:00
P = 4 - 100/PP
P = 4 - 100/75
P = 4 - 1,33
P = +2,67

2014-05-13T20:32:40+07:00
100/25 - 100/75 = 4 - 4/3= 8/3= 2,66..= 2,67 dioptri

maaf kaIo saIah..